Add full type support to Textmate scope selector parser in script/pegjs.js

[zm-cttae]

⚡️️ Feature Request

• I'm using the latest version of vscode-textmate-languageservice available.
• I searched existing issues, open & closed. Yes, my feature request is new.

Is your feature request related to a problem?

• As a: developer consuming the parser during internal development and maintenance,
• I want to: replace any in PEGJS parser rule bodies with *Matcher types
• So that: the parser is mostly if not fully typed.

Describe the solution you'd like

Use regular expressions and the new ts-morph type autogeneration from metadevpro/ts-pegjs#92.

Describe alternatives you've considered

Fix the type wiring in the pegconfig.json and use regexps to process the typed results.

/label ~feature-request