Simplify grammar

[nkrkv]

• Remove a bunch of conflicts
• Generalize and relax module path-based access for many rules
• Remove superfluous module_nested_path nesting

[aspeddro]

Another simplification that can be made:

There are two rules for extension, $._raw_js_extension and $._raw_ggl_extension. They are used to apply injections highlights but we can do without them.

Example for %re():

(extension_expression
  (extension_identifier) @_name
  (#eq? @_name "re")
  (expression_statement (string ((string_fragment) @regex))))

[nkrkv]

Another simplification that can be made

Oh, thank you! I’m going to move this to a separate issue.