[quantization] SDNQ core loading (#14277)
* initial
* fix code quality
* dependency test fix
* apply review suggestions
* add extras and version check
* fix gating and prefer local cache for modular
* simplify transformers registration and make the version warning silenceable
* remove pipeline level test
* only model level testing
* layers to quantizze, change em dashes
* env flag for transformers
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Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
