Qualcomm AI Engine Direct - oss model enablement (fastvit) (#5543)

Summary:
- e2e script for https://github.com/apple/ml-fastvit (fastvit_s18)
- add pass to handle mismatched tensor shape for broadcast ops when doing layout transform
- add ParamObserver for params with lots of outliers
- refactor & breakage fix

Pull Request resolved: https://github.com/pytorch/executorch/pull/5543

Reviewed By: kimishpatel

Differential Revision: D63965451

Pulled By: cccclai

fbshipit-source-id: 40cd85f60a8a539e6600cac1bfe16cdac4bb0465