activerecord: Add types for `from` to ActiveRecord ClassMethods

[dak2]

Currently, the from method is defined for the ActiveRecord::QueryMethods class, but not for the class method of the ActiveRecord type.

Therefore, User.from(something) is a type error.

However, from is actually used to chain model classes to retrieve records.

The related file in rails/rails has a comment about this. See the link below.

ref. https://github.com/rails/rails/blob/a11f0a63673d274c59c69c2688c63ba303b86193/activerecord/lib/active_record/relation/query_methods.rb#L1359-L1368

[github-actions[bot]]

@dak2 Thanks for your contribution!

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activerecord

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

@hibariya, @ksss, @Little-Rubyist, @tk0miya, 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.

[github-actions[bot]]

Thanks for your review, @ksss!

@dak2, @ksss This PR is ready to be merged. Just comment /merge to merge this PR.

[dak2]

/merge