[P4Testgen] Add a test case generation API to P4Testgen. #4374
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This PR adds the functionality to directly call into P4Testgen to generate tests, instead of writing the tests out to a file. This is useful for calling into P4Testgen directly in case you do not have memory constraints or consider the generated tests temporary objects. There is much more to be done to make this pleasant to use but this PR adds basic support. The newly added test
api_test.cppshows how this API could be used.The changes mostly involve refactoring to the test framework infrastructure. Currently, this functionality is only supported for Protobuf tests in BMv2, but can be extended to others.
This PR depends on #4372, #4369, and #4303.