[ruby-core:113623] [Ruby master Feature#19690] Add terminal colorizing gem to stdlib

Issue #19690 has been reported by ccmywish (Aoran Zeng).

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Feature #19690: Add terminal colorizing gem to stdlib
https://bugs.ruby-lang.org/issues/19690

* Author: ccmywish (Aoran Zeng)
* Status: Open
* Priority: Normal
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Recently the new version of `tracer` gem caught my eye. But I've noticed an anti-DRY pattern.

I've noticed that many libs, CLI tools implement their own logic of color support on the terminal.

These libs/CLI tools don't explicitly require a gem from RubyGems.org may be because of these reasons:
1. It's very easy to directly monkey patch `String` class to support, such as `bold`, `red`, `blue`
2. The lib is very independent, the author doesn't want any dependency. See: https://github.com/ruby/tracer/blob/master/lib/tracer/color.rb

I hope the core team consider adding `official` support for terminal colorizing, because most Ruby developers live on the terminal. If we've added it, all gems/CLI tools developers can easily add simple styles. For example, adding color to `gem` and `bundler` command is attractive. 

Next door community's `npm` seem much cooler by just using simple colors.

Could we coordinate with the gem [rainbow](https://rubygems.org/gems/rainbow)'s author to make it one of the stdlib or bundled gem like `minitest`?



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