[ruby-core:115598] [Ruby master Bug#20044] Add runtime flag and environment variable for prism

Issue #20044 has been reported by HParker (Adam Hess).

----------------------------------------
Bug #20044: Add runtime flag and environment variable for prism
https://bugs.ruby-lang.org/issues/20044

* Author: HParker (Adam Hess)
* Status: Open
* Priority: Normal
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
To enable prism to be used as the parser when running Ruby code, I would like to add a runtime flag and environment variable that allow it to be enabled. 

The flags could be,

```
ruby --prism test.rb
```

and the environment variable could be,

```
RUBY_PRISM=1 ruby test.rb
```

Previously implemented here: https://github.com/ruby/ruby/pull/9115, but merged before discussion could happen.

Things to be sure to discuss mentioned by @mame,

> * What to do with the command-line option when prism becomes the default parser in the future.
>  ** Just remove it, or leave it as a "do nothing" option?
> * What are the appropriate names.
> ** In Ruby, not absolutely but the names of features for professional use tend to be long and verbose, while those used by ordinary users tend to be short.
> * Whether to print a warning when this mode is used.



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