model : Plamo3 support (#17304)
* plamo3
* fix plamo3
* clean code
* clean up the code
* fix diff
* clean up the code
* clean up the code
* clean up the code
* clean up the code
* clean up the code
* clean up the code
* add chat_template if exist
* clean up the code
* fix cpu-backend
* chore: whitespace trim fix + typo fix
* Fix: address review feedback
* restore `FREQ_BASE_SWA` constant
* Fix: address review feedback2
* Fix:typecheck
* Fix: address review feedback3
* final cleanup
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Co-authored-by: mmngays <146910567+mmngays@users.noreply.github.com>
Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>
