[ruby-core:85363] [Ruby trunk Feature#14217] Expose RUBY_PATCHLEVEL_STR or similar with patch level info for rc/preview as a constant

Issue #14217 has been updated by shayonj (Shayon Mukherjee).


Is it possible to know, if this is still work keeping open to or if its being considered by the core team? :)

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Feature #14217: Expose RUBY_PATCHLEVEL_STR or similar with patch level info for rc/preview as a constant 
https://bugs.ruby-lang.org/issues/14217#change-70143

* Author: shayonj (Shayon Mukherjee)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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## Problem
When ruby is in release candidate or preview, ```RUBY_PATCHLEVEL``` is ```-1```. Without parsing ```RUBY_DESCRIPTION```, its hard to tell using constant the right and absolute ruby version.

## Proposal
Expose RUBY_PATCHLEVEL_STR as a constant, just like ```RUBY_VERSION``` or ```RUBY_PATCHLEVEL```. So that, we can know the right ruby version, especially when its in preview or release candidate. This is also helpful when using gems that rely on  ```RUBY_PATCHLEVEL``` and  ```RUBY_VERSION``` to serve the right experience. Example: Bundler, which validates gem installation by making sure right ruby is installed. Currently, we cannot install gems using 2.5.0preview1.


~~~
Your Ruby version is 2.5.0, but your Gemfile specified 2.5.0preview1
~~~

This can be handled in bundler through some different wokraround, but I think by exposing ```RUBY_PATCHLEVEL_STR```, it will be helpful in building the appropriate solutions.



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