[Quant] Add SupportsQuant and packed_modules_mapping to all models

[kylesayrs]

Purpose

• Introduce SupportsQuant which
  • Initializes the quant_config attribute and updates the quant_config with the relevant packed_modules_mapping
  • Marks a model as being capable of supporting quantized inference
  • In the future, will check if a model has been correctly defined, for example if prefixes and quant_configs have been passed correctly
  • In the future, may remap ignored_modules according to the hf_to_vllm_mapper
• This mixin will replace the configure_quant_config function after it has been added to a sufficient number of models
• These changes reflect the issue that configure_quant_config assumes that all packed_modules_mappings will be declared prior to initialization. In reality, some models are submodels of each other, so their mappings can only be determined at init time.
  • Using a mixin which updates after class is initialized but the mapping before the parameters init guarantees that the config is up to date w.r.t. mappings before the parameters init

Related PRs

• [Quant] Add SupportsQuant to phi3 and clip #13104
• [Quant] BaiChuan SupportsQuant #13710
• [Quant] Aria SupportsQuant #13416
• [Quant] Arctic SupportsQuant #13366
• [Quant] Molmo SupportsQuant #13336

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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

[hmellor]

Closing as this work was completed incrementally via individual model PRs (#14698, #14699, #15573, #15952, and others).