Create `@huggingface/transformers-structured-output` package (#1758)

* first draft for #1328 using llguidance

* removed plan

* replaced response_schema with logits_processor

* clean up

* first POC

* added LlguidanceConstraint

* added regex example

* clean up and added more unit tests

* clean up

* performance improvements

* updated llguidamce to 0.2.0

* clean up

* copilot review

* removed llguidance dependency and created a much faster variant of response-constraint

* clean up

* removed onTokensSampled

* added whitespace penalty

* clean-up

* reverts after review

* fixed tokenizer issue

* fixed tests

* renamed the package to @huggingface/transformers-structured-output

* removed stopping criteria

* small fix