Adding validation command to the agent

[chkeita]

This PR adds a new option to the onefuzz agent to help validate a fuzzer

> cargo run --bin onefuzz-agent -- validate --help                   
   Compiling onefuzz-agent v0.1.0 (C:\work\onefuzz\src\agent\onefuzz-agent)
    Finished dev [unoptimized + debuginfo] target(s) in 3.72s
     Running `target\debug\onefuzz-agent.exe validate --help`
Usage: onefuzz-agent.exe validate <COMMAND>

Commands:
  run_setup           Run the setup script
  validate_libfuzzer  Validate the libfuzzer target
  execution_log       Get the execution logs to debug loading issues
  help                Print this message or the help of the given subcommand(s)

Options:
  -h, --help  Print help

[codecov-commenter]

Codecov Report

Merging #2948 (d8026c8) into main (ac789fa) will decrease coverage by 0.08%.
The diff coverage is 14.94%.

@@            Coverage Diff             @@
##             main    #2948      +/-   ##
==========================================
- Coverage   29.09%   29.01%   -0.08%     
==========================================
  Files         303      304       +1     
  Lines       36170    36313     +143     
==========================================
+ Hits        10523    10537      +14     
- Misses      25647    25776     +129     

Impacted Files	Coverage Δ
src/agent/dynamic-library/src/windows.rs	19.16% <0.00%> (-1.49%)	⬇️
src/agent/onefuzz-agent/src/main.rs	0.41% <0.00%> (-0.01%)	⬇️
src/agent/onefuzz-agent/src/setup.rs	0.00% <0.00%> (ø)
src/agent/onefuzz-agent/src/validations.rs	0.00% <0.00%> (ø)
src/agent/dynamic-library/src/linux.rs	87.79% <45.00%> (-5.76%)	⬇️
src/agent/onefuzz-agent/src/work.rs	14.17% <100.00%> (+1.86%)	⬆️
src/agent/onefuzz/src/blob/url.rs	72.29% <100.00%> (+0.46%)	⬆️
src/agent/onefuzz/src/libfuzzer.rs	69.56% <100.00%> (ø)

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