[SAI_P4] Add helper functions to access experimental capabilities.

[bibhuprasad-hcl]

PR Description:

Add helper functions to access experimental capabilities.

Keyword Check:

sonic-buildimage/src/sonic-p4rt/sonic-pins/sai_p4$ sh ~/keyword_check.sh .
Keyword check Passed.

Build Results:

bibhuprasad@6100c4ceb409:/sonic/src/sonic-p4rt/sonic-pins$ bazel build $BAZEL_BUILD_OPTS ...
INFO: Analyzed 779 targets (0 packages loaded, 0 targets configured).
INFO: Found 779 targets...
INFO: Elapsed time: 0.423s, Critical Path: 0.00s
INFO: 1 process: 1 internal.
INFO: Build completed successfully, 1 total action

UT Results:

bibhuprasad@6100c4ceb409:/sonic/src/sonic-p4rt/sonic-pins$ bazel test $BAZEL_BUILD_OPTS --cache_test_results=no ...
INFO: Analyzed 779 targets (0 packages loaded, 1 target configured).
INFO: Found 542 targets and 237 test targets...
INFO: Elapsed time: 208.035s, Critical Path: 145.62s
INFO: 294 processes: 347 linux-sandbox, 19 local.
INFO: Build completed successfully, 294 total actions
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//sai_p4/instantiations/google:sai_nonstandard_platforms_cc_test PASSED in 1.7s
//sai_p4/instantiations/google:sai_p4info_fetcher_test PASSED in 2.1s
//sai_p4/instantiations/google:sai_p4info_test PASSED in 2.8s
//sai_p4/instantiations/google:sai_pd_proto_test PASSED in 0.4s
//sai_p4/instantiations/google:sai_pd_util_test PASSED in 1.5s
//sai_p4/instantiations/google:tor_p4info_up_to_date_test PASSED in 0.3s
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//sai_p4/instantiations/google/test_tools:table_entry_generator_helper_test PASSED in 6.5s
//sai_p4/instantiations/google/test_tools:test_entries_test PASSED in 3.9s
//sai_p4/instantiations/google/tests:p4_fuzzer_integration_test PASSED in 8.4s
//sai_p4/tools:auxiliary_entries_for_v1model_targets_test PASSED in 3.7s
//sai_p4/tools:p4info_tools_test PASSED in 2.3s
//sai_p4/tools:packetio_tools_test PASSED in 2.1s
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//tests/qos:gnmi_parsers_test PASSED in 0.4s
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//thinkit:mock_ssh_client_test PASSED in 0.3s
//thinkit:mock_switch_test PASSED in 2.3s
//thinkit:mock_test_environment_test PASSED in 0.5s
//thinkit:switch_test PASSED in 2.1s
//tests/lib:packet_generator_test PASSED in 65.4s
Stats over 4 runs: max = 65.4s, min = 62.1s, avg = 63.2s, dev = 1.3s
//sai_p4/instantiations/google/tests:p4_constraints_integration_test PASSED in 3.7s
Stats over 5 runs: max = 3.7s, min = 2.0s, avg = 2.7s, dev = 0.6s
//sai_p4/instantiations/google/test_tools:table_entry_generator_test PASSED in 45.9s
Stats over 50 runs: max = 45.9s, min = 1.5s, avg = 4.7s, dev = 8.6s

Executed 237 out of 237 tests: 237 tests pass.

[mssonicbld]

/azp run

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[mssonicbld]

/azp run

[azure-pipelines]

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[mssonicbld]

/azp run

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