Implement naming conventions in Ruby grammar

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Description of the Change

This is a rewrite of the Tree-sitter grammar to implement naming conventions for syntax scopes.

Benefits

• Many new scopes added to make the grammar explicit and exhaustive.
• Notable improvements on punctuation, keywords and support functions.
• Highlighting to be consistent with other languages.

Possible Drawbacks

Some new scopes to be added to themes. The changes aim to facilitate theme development, filling the template is enough to ensure coherent highlighting across languages, instead of painfully creating styling rules for every language separately.

Applicable Issues

• https://github.com/atom/atom/issues/8430

Related Pull Requests

• Naming conventions documentation
• Implementation in template theme
• Implementation in default syntax themes
• Implementation in C and C++ grammars
• Implementation in CSS grammar
• Implementation in Go grammar
• Implementation in HTML grammar
• Implementation in JavaScript and Regex grammars
• Implementation in Python grammar

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Preview of the changes with Atom's default syntax themes:

Without naming conventions (current Tree-sitter grammar)	With naming conventions in theme and Tree-sitter grammar
Solarized Dark	Solarized Dark
One Dark	One Dark
Base16 Tomorrow Dark	Base16 Tomorrow Dark
Atom Dark	Atom Dark
Solarized Light	Solarized Light
One Light	One Light
Base16 Tomorrow Light	Base16 Tomorrow Light
Atom Light	Atom Light

Code snippet:

require 'nebuchadnezzar.rb'

# That is the sound of inevitability

BEGIN {
  call = ['Knock', 'Knock', 'Neo']
  call.each do |x| puts x end
}

follow = /^(?:white)\s[rR]ab{2}it$/

door == 101 ? IO.open : IO.close

module Program
  class Smith < Agent

    include KungFu

    def -@
      super %(zion = #{23 << 1})
    end

    public
    def capture(morpheus: nil)
      if block_given?
        yield self
      else
        @humans = virus | mammal
      end
    end

    alias_method 'torment', :capture
  end
end

$red_dress = Program::Smith.new

$red_dress&.torment(morpheus: true)

begin
  6.times { *pills = :red, :blue }
rescue => unplug
  PHONEBOOTH = {
    'last_name': 'Anderson',
    :first_name => 'Thomas'
  }
end