[ruby/prism] Dev-only CLI

We keep adding more scripts to /bin that are doing the same kinds
of processing. Instead, this commit consolidates them all into a
single CLI that shares the same logic so that we can consistently
read files in the same way.

It keeps around 2 binstubs for bin/lex and bin/parse since those
are the most used and I'm sure people have built up muscle memory
for those. Those scripts are now just wrappers for forwarding to
bin/prism.

https://github.com/ruby/prism/commit/bddcb9bf17

lib/prism/lex_compat.rb

@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require "delegate"
+require "ripper"
 
 module Prism
   # This class is responsible for lexing the source using prism and then