Add new plugin_name to DocSchema

[sivel]

In ansible/ansible@bec27fb we added a new plugin_name field to the ansible-doc output. This PR adds this new field to the DocSchema class

See ansible/ansible-documentation#1079

[gotmax23]

@felixfontein, we should also consider getting rid of the extra="forbid" config. I don't think we need to be that strict here.

[sivel]

I'm not sure what is going on with the lint job:

nox > pylint --rcfile .pylintrc.automated src/antsibull_docs src/sphinx_antsibull_ext
************* Module antsibull_docs._pydantic_compat
src/antsibull_docs/_pydantic_compat.py:19:27: E1101: Function 'version' has no 'VERSION' member (no-member)

This seems to be indicating a change to pydantic, and nothing I've done.

[gotmax23]

I think it'd make more sense to set this to None if it's not part of the docs schema.

Suggested change

	plugin_name: str = ""
	plugin_name: t.Optional[str] = None

[sivel]

filename is also the same, it's added by ansible-doc and not part of the docs schema itself, was following that as my example.

[gotmax23]

Okay, fair enough.

[gotmax23]

This seems to be indicating a change to pydantic, and nothing I've done.

There was a new pydantic release yesterday that's likely the culprit. pydantic does some funky module-level __getattr__() stuff that sometimes confuses static analysis tools. I'm not sure why pylint thinks a module is a function...

[sivel]

I've pushed a fix for the pylint issue in this PR. Except for now some codecov stuff...

[felixfontein]

@felixfontein, we should also consider getting rid of the extra="forbid" config. I don't think we need to be that strict here.

For the docs rendering part, ok. For the linting part, we must be strict.

[felixfontein]

Looks OK, except that it's missing a changelog fragment. I can push one.

[felixfontein]

@sivel thanks for fixing this!
@gotmax23 thanks for reviewing!

[gotmax23]

Thanks everyone!