activerecord: Fix the location of #with_recursive

[tk0miya]

It is defined at ActiveRecord::QueryMethods, not ActiveRecord:: Relation::QueryMethods.

Unfortunately, it works well even if the wrong location. But it conceals other methods defined in AR::QueryMethods.

refs: #662

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[ksss]

How about merging module QueryMethods?

[tk0miya]

I'm worried about the sub-modules and classes becoming bigger.

module QueryMethods
  class WhereChain[Relation]
     (long long definitions)
   end

  module OtherMod
    (also very long)
  end

  def with_recursive: (*untyped) -> untyped
  def with_recursive!: (*untyped) -> untyped
end

I know I worry too much, but activerecord is a large library.
Therefore, I think it's better to separate definitions per module or class.
For example, ActiveRecord::Relation and ActiveRecord::Associations have many sub-modules.