[SupportsQuant] Bert, Blip, Blip2, Bloom

[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 bert, blip, blip2, and bloom

[github-actions]

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[DarkLight1337]

Btw to avoid regressions, do we have an easy way to test whether the model can load quantized weights successfully? Perhaps using dummy weights? cc @mgoin

[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