activerecord: Add ActiveRecord::TokenFor::RelationMethods

[tk0miya]

refs:

• activerecord: Add ActiveRecord::Base.generates_tokens_for #659
• Refactor ActiveRecord::TokenFor to not rely on relation delegation rails/rails#51801
• https://api.rubyonrails.org/classes/ActiveRecord/TokenFor/RelationMethods.html
• https://github.com/rails/rails/blob/v7.2.2/activerecord/lib/active_record/token_for.rb

[github-actions]

@tk0miya Thanks for your contribution!

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[ksss]

APPROVE

[github-actions]

Thanks for your review, @ksss!

@tk0miya, @ksss This PR is ready to be merged.
Just comment /merge to merge this PR.

[tk0miya]

/merge