gh-153569: hide tokenizer state behind token and source operations - #156654
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Make pegen and
_tokenizeconsume tokenizer operations instead of accessing the tokenizer layout. Return token kind, span, location, and raw-string context together, so parser actions use the context of the cached token.Represent persistent scanner positions as offsets and remove pointer save/restore bookkeeping when input storage grows.
Part of gh-153569.
Previous: #156484. Next: #157055.
Please do not review until #156484 lands.