[ruby-core:116084] [Ruby master Feature#20164] Add Exception#deconstruct_keys

Issue #20164 has been reported by Dan0042 (Daniel DeLorme).

----------------------------------------
Feature #20164: Add Exception#deconstruct_keys
https://bugs.ruby-lang.org/issues/20164

* Author: Dan0042 (Daniel DeLorme)
* Status: Open
* Priority: Normal
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It would be convenient to perform pattern matching with exception classes. So `Exception#deconstruct_keys` should return a hash with `:message` (original_message) as well as any other keys specific to the exception subclass.

Examples:
```
begin
  #code
rescue => err
  case err
  in StandardError(message: /Permission denied/) 
    abort "please select a different file"
  in NameError(name: :foo)
    retry if require "foo_helper
  else
    raise
  end
end
```



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