fix: broken relative imports for proto output types generation

[Dimitrioglo]

Summary

• Fixed broken relative imports for output types generation
• Added possibility to generate interfaces for folder containing subfolders of .proto files
• Refactored get_directories to return only first-level directories
• Covered with the tests case when imports can be not generated

Checklist

• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• This PR fixes an issue. #472 #441
• This PR adds something new (e.g. new method or parameters).
  • This change has an associated test.
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)

[Dimitrioglo]

Can you check please? @danielgtaylor, @Gobot1234

[Gobot1234]

Please can you add a test for this case?

[Dimitrioglo]

Please can you add a test for this case?

Done, can you check?

@Gobot1234 @danielgtaylor

[Dimitrioglo]

@Gobot1234 Can you process with review?

[Gobot1234]

Please can you run the code through black

[Dimitrioglo]

@Gobot1234 fixed pre-commit hooks issues

[Dimitrioglo]

@Gobot1234 is any chance this fix will be released in next weeks/month?

[Dimitrioglo]

@Gobot1234 , @danielgtaylor Any news guys?

[Gobot1234]

Not sure why linux CI is failing

[mohd-saaduddin-ansari]

Hi @danielgtaylor , i am also facing the broken relative imports issue. when can we merge this PR ?

[Gobot1234]

It will be merged when the CI is fixed

[haydenflinner]

Results seem to have aged out, but I think the lack of this PR is why betterproto doesn't work with the Protobufs I'm trying to use now.