[SupportsQuant] Chameleon, Chatglm, Commandr

[kylesayrs]

Purpose

• Introduce SupportsQuant mixin to models in order to uniformity support quantization across all models
  • packed_modules_mapping is correctly updated across nested models
  • ignored modules are correctly updated according to hf_to_vllm_mapper and across nested models

Related Issues

• [Quant] Add SupportsQuant and packed_modules_mapping to all models #14631
• [Quant] SupportsQuant handles ignored_modules #14635

Changes

• Add SupportsQuant and packed_modules_mapping attribute to Chameleon, Chatglm, and Commandr
• Note that the packed_modules_mapping is already defined on the Chatglm inherited class, not the base class

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[mergify]

This pull request has merge conflicts that must be resolved before it can be
merged. Please rebase the PR, @kylesayrs.

https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/syncing-a-fork