Export from steep

[ksss]

Steep has definitions for the parser, https://github.com/soutaro/steep/tree/55c58d0f8aa1fc65a8add95a5fde43f6b4375164/sig/shims but they conflict with those in gem_rbs_collection, so only one can be used.

I believe the best approach for the community is to support and develop the ones in gem_rbs_collection.

Here are the steps I propose:

1. Stop distributing the sig directory from Steep.
2. Merge the parser definitions from Steep into gem_rbs_collection.

@soutaro @pocke How about you all?

[github-actions[bot]]

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parser

You changed RBS files for an existing gem. You need to get approval from the reviewers of this gem.

@pocke, please review this pull request. If this change is acceptable, please make a review comment including APPROVE from here.

After that, the PR author or the reviewers can merge this PR. Just comment /merge to merge this PR.

[pocke]

BTW I checked the contributors of the RBS files for the parser gems. There is no contributor other than Soutaro-san. So we do not need to be concerned about the license (if Soutaro-san approves it of course). https://github.com/soutaro/steep/commits/master/sig/shims/parser

[soutaro]

I didn't have an idea to export the interfaces. They are opinionated, unfinished, and not used in fact recently... Totally 👍 for other parts.