Rename bazel_features.bzlmod to bazel_features.external_deps

[Wyverald]

Continuing the trend of de-emphasizing the name "Bzlmod". I think it would make more sense to group features related to external dependencies together, instead of just Bzlmod features. Not sure whether this should be called external or external_deps or just repos, so I just went with the shortest one.

[meteorcloudy]

I slightly prefer external_deps a bit since it's more intuitive.

[meteorcloudy]

@alexeagle Can you add @fmeum as a collaborator on this repo? It seems I cannot assign him as reviewer.

[fmeum]

I am in the rules_authors team now, but don't seem to have permissions for this particular repo.

[Wyverald]

@fmeum would you prefer external_deps as well? I'm personally undecided so will go with the majority vote.

[fmeum]

I also prefer external_dep as module extensions naturally fall under it, but aren't repositories.

[alexeagle]

@fmeum what access would you like that you don't get as a rules-authors team member?

[fmeum]

@fmeum what access would you like that you don't get as a rules-authors team member?

Given that we probably want to protect the main branch with required reviews, could you give me write permissions so that I can approve PRs?