support both openapi and swaager

[yishanhe]

• support two providers by asking user to provide a provider[swagger, openapi] during the init the repository

[yishanhe]

This is related to addressing issue #27 , instead of deprecating, as swagger codegen is alive as well. might just support both.

[softprops]

@yishanhe thanks for pull.

Would you be able to add a test case covering your changes to make sure these changes have the impact you're looking for and not regress the current rules?

You can find the current test runner here

[yishanhe]

@softprops agree with the test coverage requirements. when I looked at the existing tests, it is really trivial, current test is more like testing reproducibility (not functional correctness). any suggestion on tests that I can add? Thanks.

[softprops]

It may make sense to create a variation that test that uses the openapi provider

[softprops]

Thanks @yishanhe!