feat(bigtable): table resource name as a class

[dbolduc]

Fixes #9348

Plagiarized from spanner/database.h

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This change is 

[google-cloud-cpp-bot]

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For commit: 7e86f6c77905d36f383c4abe9d500f4793acdcfc

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[codecov]

Codecov Report

Merging #9377 (7e86f6c) into main (a5b052d) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #9377   +/-   ##
=======================================
  Coverage   94.64%   94.64%           
=======================================
  Files        1474     1477    +3     
  Lines      135379   135441   +62     
=======================================
+ Hits       128133   128193   +60     
- Misses       7246     7248    +2     

Impacted Files	Coverage Δ
google/cloud/bigtable/table_resource.cc	100.00% <100.00%> (ø)
google/cloud/bigtable/table_resource.h	100.00% <100.00%> (ø)
google/cloud/bigtable/table_resource_test.cc	100.00% <100.00%> (ø)
...e/cloud/pubsublite/internal/alarm_registry_impl.cc	97.05% <0.00%> (-2.95%)	⬇️
google/cloud/pubsub/subscriber_connection_test.cc	97.22% <0.00%> (-0.70%)	⬇️
...cloud/pubsub/internal/subscription_session_test.cc	98.00% <0.00%> (ø)

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