Add type definitions to delete_all

[kazuyainoue0124]

Fix types definitions for delete_all methods.
Changed the return type of delete_all methods to Integer.

[github-actions]

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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, 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.

[tk0miya]

FYI: API doc mentions the return value of #delete_all.

Returns the number of rows affected.
https://api.rubyonrails.org/classes/ActiveRecord/Relation.html#method-i-delete_all

[ksss]

How was the effect of this change?

Perhaps gems/activerecord/6.0/activerecord.rbs also needs to be modified for substantial effect.

[tk0miya]

I noticed ActiveRecord::Associations::CollectionProxy#delete_all takes an optional argument dependent. But ActiveRecord::Associations::Relation#delete_all does not take arguments at all.

But the current design of rbs_rails expects both to be the same.
Therefore it's not good to modify definitions under activerecord.rbs (ActiveRecord::Relation::Methods, ActiveRecord::Base::ClassMethods, _ActiveRecord_Relation and _ActiveRecord_Relation_ClassMethods).

It's better to change only the return types of these methods under activerecord.rbs.
And we need to hack rbs_rails to override the argument type of CollectionProxy#delete_all via rbs_rails like pocke/rbs_rails#289 does.

Refs:

• https://api.rubyonrails.org/classes/ActiveRecord/Associations/CollectionProxy.html#method-i-delete_all
• https://api.rubyonrails.org/classes/ActiveRecord/Relation.html#method-i-delete_all

[kazuyainoue0124]

Thank you for your valuable feedback.
I apologize for not fully understanding the differences between ActiveRecord::Associations::CollectionProxy#delete_all and ActiveRecord::Associations::Relation#delete_all, as well as the specifics of rbs_rails.

In this pull request, I have only updated the return types.
I will address the override of CollectionProxy#delete_all in rbs_rails separately.

If there are any remaining issues, please let me know.

[ksss]

Sorry for the delay in responding.

• When modifying 6.0/activerecord-generated.rbs, move as far as possible to 6.0/activerecord.rbs.
• I would like at least one line of testing.