[ruby-core:121299] [Ruby master Feature#21182] Add Hash#rename

Issue #21182 has been reported by calebm (Caleb Meyer).

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Feature #21182: Add Hash#rename
https://bugs.ruby-lang.org/issues/21182

* Author: calebm (Caleb Meyer)
* Status: Open
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Abstract: Implement Hash#rename which takes as arguments a from key and a to key and renames the from key to the new name.

Background: One of the most common data transformations for a hash (in my experience) is renaming a single key. You can do this with the existing hash methods (e.g. `hash['new'] = hash.delete('old')` or `hash.transform_keys('old' => 'new')`) but they feel a bit clunky.

Proposal:

Add a new method to Hash, something like this:
```ruby
class Hash
  # usage { old: 'value' }.rename(:old, to: :new)
  # => { new: 'value' }
  def rename(from, to:)
    transform_keys(from => to)
  end

  def rename!(from, to:)
    transform_keys!(from => to)
  end
end
```



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