[Comb] Add timer class, taken from packet synthesizer.

[VSuryaprasad-HCL]

Keyword Check:
~/sonic-buildimage/src/sonic-p4rt/sonic-pins$ ~/tools/keyword_checks.sh .
Keyword check Passed.

Build Result:
/sonic/src/sonic-p4rt/sonic-pins$ bazel build $BAZEL_BUILD_OPTS ...
INFO: Analyzed 637 targets (156 packages loaded, 21642 targets configured).
INFO: Found 637 targets...
INFO: From Compiling p4_symbolic/ir/cfg.cc [for host]:
In file included from p4_symbolic/ir/cfg.cc:15:
./p4_symbolic/ir/cfg.h:79:3: warning: multi-line comment [-Wcomment]
79 | // /
| ^
p4_symbolic/ir/cfg.cc:349:5: warning: multi-line comment [-Wcomment]
349 | // /
| ^
p4_symbolic/ir/cfg.cc:388:7: warning: multi-line comment [-Wcomment]
388 | // /
| ^
p4_symbolic/ir/cfg.cc: In function 'p4_symbolic::ir::ControlPath p4_symbolic::ir::{anonymous}::LongestCommonPrefix(const ControlPath&, const ControlPath&)':
p4_symbolic/ir/cfg.cc:101:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
101 | while (index < l.size() && index < r.size() && l[index] == r[index]) {
| ~~~~~~^~~~~~~~~~
p4_symbolic/ir/cfg.cc:101:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
101 | while (index < l.size() && index < r.size() && l[index] == r[index]) {
| ~~~~~~^~~~~~~~~~
INFO: From Compiling p4_symbolic/ir/ir.cc [for host]:
In file included from p4_symbolic/ir/ir.cc:39:
./p4_symbolic/ir/cfg.h:79:3: warning: multi-line comment [-Wcomment]
79 | // /
| ^
INFO: From Compiling p4_symbolic/symbolic/util.cc [for host]:
INFO: From Compiling p4_symbolic/tests/sai_p4_component_test.cc:
In file included from p4_symbolic/tests/sai_p4_component_test.cc:22:
p4_symbolic/tests/sai_p4_component_test.cc: In member function 'virtual void p4_symbolic::{anonymous}::P4SymbolicComponentTest_CanGenerateTestPacketsForSimpleSaiP4Entries_Test::TestBody()':
p4_symbolic/tests/sai_p4_component_test.cc:128:32: warning: 'absl::lts_20230802::StatusOrp4::v1::TableEntry pdpi::PartialPdTableEntryToPiTableEntry(const pdpi::IrP4Info&, const google::protobuf::Message&, const pdpi::TranslationOptions&)' is deprecated: Use PdTableEntryToPiEntity instead [-Wdeprecated-declarations]
128 | pdpi::PartialPdTableEntryToPiTableEntry(ir_p4info, pd_entry));
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
./gutil/status_matchers.h:63:43: note: in definition of macro 'ASSERT_OK_AND_ASSIGN'
63 | auto __ASSIGN_OR_RETURN_VAL(LINE) = expression;
| ^~~~~~~~~~
In file included from p4_symbolic/tests/sai_p4_component_test.cc:27:
./p4_pdpi/pd.h:142:36: note: declared here
142 | absl::StatusOrp4::v1::TableEntry PartialPdTableEntryToPiTableEntry(
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from p4_symbolic/tests/sai_p4_component_test.cc:22:
p4_symbolic/tests/sai_p4_component_test.cc:128:85: warning: 'absl::lts_20230802::StatusOrp4::v1::TableEntry pdpi::PartialPdTableEntryToPiTableEntry(const pdpi::IrP4Info&, const google::protobuf::Message&, const pdpi::TranslationOptions&)' is deprecated: Use PdTableEntryToPiEntity instead [-Wdeprecated-declarations]
128 | pdpi::PartialPdTableEntryToPiTableEntry(ir_p4info, pd_entry));
| ^
./gutil/status_matchers.h:63:43: note: in definition of macro 'ASSERT_OK_AND_ASSIGN'
63 | auto __ASSIGN_OR_RETURN_VAL(LINE) = expression;
| ^~~~~~~~~~
In file included from p4_symbolic/tests/sai_p4_component_test.cc:27:
./p4_pdpi/pd.h:142:36: note: declared here
142 | absl::StatusOrp4::v1::TableEntry PartialPdTableEntryToPiTableEntry(
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
INFO: Elapsed time: 83.439s, Critical Path: 12.71s
INFO: 112 processes: 21 internal, 91 linux-sandbox.
INFO: Build completed successfully, 112 total actions

Test Result:
/sonic/src/sonic-p4rt/sonic-pins$ bazel test $BAZEL_BUILD_OPTS --cache_test_results=no ...
INFO: Analyzed 637 targets (0 packages loaded, 367 targets configured).
INFO: Found 426 targets and 211 test targets...
INFO: Elapsed time: 180.903s, Critical Path: 114.52s
INFO: 265 processes: 320 linux-sandbox, 18 local.
INFO: Build completed successfully, 265 total actions
//dvaas:port_id_map_test PASSED in 0.9s
//dvaas:test_run_validation_golden_test PASSED in 0.1s
//dvaas:test_run_validation_test PASSED in 0.6s
//dvaas:test_run_validation_test_runner PASSED in 0.0s
//dvaas:test_vector_stats_diff_test PASSED in 0.0s
//dvaas:test_vector_stats_test PASSED in 0.0s
//dvaas:test_vector_test PASSED in 0.6s
//dvaas:user_provided_packet_test_vector_diff_test PASSED in 0.1s
//dvaas:user_provided_packet_test_vector_test PASSED in 0.1s
//gutil:collections_test PASSED in 0.5s
//gutil:io_test PASSED in 0.5s
//gutil:proto_matchers_test PASSED in 0.8s
//gutil:proto_ordering_test PASSED in 0.6s
//gutil:proto_test PASSED in 0.6s
//gutil:status_matchers_test PASSED in 0.5s
//sai_p4/instantiations/google:sai_nonstandard_platforms_cc_test PASSED in 0.6s
//sai_p4/instantiations/google:sai_p4info_fetcher_test PASSED in 0.7s
//sai_p4/instantiations/google:sai_p4info_test PASSED in 1.1s
//sai_p4/instantiations/google:sai_pd_proto_test PASSED in 0.1s
//sai_p4/instantiations/google:sai_pd_util_test PASSED in 0.6s
//sai_p4/instantiations/google:tor_p4info_up_to_date_test PASSED in 0.0s
//sai_p4/instantiations/google:union_p4info_up_to_date_test PASSED in 0.1s
//sai_p4/instantiations/google:wbb_p4info_up_to_date_test PASSED in 0.0s
//sai_p4/instantiations/google/test_tools:table_entry_generator_helper_test PASSED in 1.3s
//sai_p4/instantiations/google/test_tools:test_entries_test PASSED in 0.9s
//sai_p4/instantiations/google/tests:p4_fuzzer_integration_test PASSED in 3.6s
//sai_p4/tools:p4info_tools_test PASSED in 0.7s
//sai_p4/tools:packetio_tools_test PASSED in 0.8s
//tests:thinkit_gnmi_interface_util_tests PASSED in 1.1s
//tests/lib:p4info_helper_test PASSED in 1.0s
//tests/lib:p4rt_fixed_table_programming_helper_test PASSED in 0.8s
//tests/lib:packet_generator_test PASSED in 26.7s
//tests/lib:switch_test_setup_helpers_golden_test PASSED in 0.1s
//tests/lib:switch_test_setup_helpers_golden_test_runner PASSED in 0.1s
//tests/qos:gnmi_parsers_test PASSED in 0.1s
//tests/qos:gnmi_parsers_test_runner PASSED in 0.0s
//tests/sflow:sflow_util_test PASSED in 0.9s
//thinkit:bazel_test_environment_test PASSED in 0.7s
//thinkit:generic_testbed_test PASSED in 1.0s
//thinkit:mock_control_device_test PASSED in 0.5s
//thinkit:mock_generic_testbed_test PASSED in 0.8s
//thinkit:mock_mirror_testbed_test PASSED in 0.7s
//thinkit:mock_ssh_client_test PASSED in 0.0s
//thinkit:mock_switch_test PASSED in 0.7s
//thinkit:mock_test_environment_test PASSED in 0.1s
//thinkit:switch_test PASSED in 0.9s
//sai_p4/instantiations/google/tests:p4_constraints_integration_test PASSED in 0.9s
Stats over 5 runs: max = 0.9s, min = 0.7s, avg = 0.8s, dev = 0.1s
//sai_p4/instantiations/google/test_tools:table_entry_generator_test PASSED in 44.1s
Stats over 50 runs: max = 44.1s, min = 0.8s, avg = 3.0s, dev = 8.4s

Executed 211 out of 211 tests: 211 tests pass.
INFO: Build completed successfully, 265 total actions

[mssonicbld]

/azp run

[azure-pipelines]

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[mssonicbld]

/azp run

[azure-pipelines]

No pipelines are associated with this pull request.