Fixed #23356: Removed hardcoded verbatim logic from Lexer.

[atul-bhouraskar]

The verbatim tag was a special case handled in the Lexer. Added Parser.parse_verbatim() that can be called by any custom tag that needs to implement verbatim like behaviour.

[atul-bhouraskar]

@felixxm Branch now rebased to main. Changes in main mean that create_token() is now even simpler! Thanks for your time.

[felixxm]

Closing per comment.