WIP: [RRIO] [Call] Caller, SetupTeardown Interfaces and Integration Tests

[damondouglas]

This WIP PR begins the Python RRIO implementation.

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[liferoad]

rrio.py instead of the full name?

[damondouglas]

Thank you so much for reviewing, @liferoad. I personally prefer with you the abbreviation. It was on the original Java until the Java was changed to the full requestresponse (without the io part of the name). To maintain consistency with the Java, I reasoned to spell out the full name. What do others prefer (cc: @Abacn , @johnjcasey , @riteshghorse , @ahmedabu98)

[damondouglas]

@riteshghorse I wonder if the numerous failed checks is due to needing to either skip the integration test or configure so it passes during the checks. I prefer skipping the integration test for now in this PR.

[riteshghorse]

Could be. RAT failure is because of missing license in files. Let me check the others

[damondouglas]

I'm attempting one by one and looking at the checks they are performing and running them locally in hopes of finding the issue.

[riteshghorse]

I'm also seeing this error

ERROR: Could not install packages due to an OSError: [Errno 2] No such file or directory: '/.test-infra/mock-apis/src/main/python' 

in beam_PreCommit_Python_Coverage

[riteshghorse]

I'm also seeing this error

ERROR: Could not install packages due to an OSError: [Errno 2] No such file or directory: '/.test-infra/mock-apis/src/main/python' 

in beam_PreCommit_Python_Coverage

It looks like it didn't include the two .. while building the path for mock-apis - 'mock-apis@ file:///.test-infra/mock-apis/src/main/python'

[riteshghorse]

Weird why parquetIO tests are failing here.. checking it now

[damondouglas]

@riteshghorse as we talked about, closing this PR.