[ruby-core:84694] [Ruby trunk Feature#14332] Module.used_refinements to list refinement modules

Issue #14332 has been reported by Eregon (Benoit Daloze).

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Feature #14332: Module.used_refinements to list refinement modules
https://bugs.ruby-lang.org/issues/14332

* Author: Eregon (Benoit Daloze)
* Status: Open
* Priority: Normal
* Assignee: shugo (Shugo Maeda)
* Target version: 2.6
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Module.used_modules was added in #7418.
But I think `Module.used_refinements` is more useful or at least complementary.

Refinements were implemented in TruffleRuby, and I found Module.used_refinements so useful that I left it there.

Instead of listing namespace modules (arguments to #using), it lists the refinement modules:

~~~ ruby
module Json
  refine Integer do
    def to_json
      to_s
    end
  end

  refine String do
    def to_json
      inspect
    end
  end
end

module Fact
  refine Integer do
    def fact
      self <= 1 ? 1 : self * (self-1).fact
    end
  end
end

using Json
p Module.used_modules # => [Json]
p Module.used_refinements # => [#<refinement:Integer@Json>, #<refinement:String@Json>]

using Fact
p Module.used_modules # => [Json, Fact]
p Module.used_refinements # => [#<refinement:Integer@Fact>, #<refinement:Integer@Json>, #<refinement:String@Json>]
~~~

This shows which classes are refined and by which refinement namespace.
It also shows if a class has multiple active refinements in the scope.
And, last but not least, the name of the method is contains "refinements".
I find `used_modules` hard to remember and it doesn't sound related to refinements from the name (while looking at the Module's methods).



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