[Whisper] Add sequential longform decoding (#27492)
* [Whisper] Add seq gen
* [Whisper] Add seq gen
* more debug
* Fix whisper logit processor
* Improve whisper code further
* Fix more
* more debug
* more debug
* Improve further
* Add tests
* Prep for batch size > 1
* Get batch_size>1 working
* Correct more
* Add extensive tests
* more debug
* more debug
* more debug
* add more tests
* more debug
* Apply suggestions from code review
* more debug
* add comments to explain the code better
* add comments to explain the code better
* add comments to explain the code better
* Add more examples
* add comments to explain the code better
* fix more
* add comments to explain the code better
* add comments to explain the code better
* correct
* correct
* finalize
* Apply suggestions from code review
* Apply suggestions from code review
