Separate chat templates into a single file (#33957)
* Initial draft
* Add .jinja file loading for processors
* Add processor saving of naked chat template files
* make fixup
* Add save-load test for tokenizers
* Add save-load test for tokenizers
* stash commit
* Try popping the file
* make fixup
* Pop the arg correctly
* Pop the arg correctly
* Add processor test
* Fix processor code
* stash commit
* Processor clobbers child tokenizer's chat template
* Processor clobbers child tokenizer's chat template
* make fixup
* Split processor/tokenizer files to avoid interactions
* fix test
* Expand processor tests
* Rename arg to "save_raw_chat_template" across all classes
* Update processor warning
* Move templates to single file
* Move templates to single file
* Improve testing for processor/tokenizer clashes
* Improve testing for processor/tokenizer clashes
* Extend saving test
* Test file priority correctly
* make fixup
* Don't pop the chat template file before the slow tokenizer gets a look
* Remove breakpoint
* make fixup
* Fix error
