Metal backend: Add Metal int4 quantization support to Parakeet export

[manuelcandales]

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[manuelcandales]

Stack from ghstack (oldest at bottom):

• -> Metal backend: Add Metal int4 quantization support to Parakeet export #17234
• Metal backend: fail test_modules.py if torchao can't be imported #17233
• Metal backend: preserve meta data in decompose_linear_pass #17232
• Metal backend: fix bugs in qmv_impl #17188
• Metal backend: import qmv_impl from MLX #17187
• Metal backend: int4 refactor checks and logs #17186
• Metal backend: test 4-bit linear with bias #17127
• Metal backend: enable quantization in test_modules #17118
• Metal backend: support 4-bit linear #17117
• Metal backend: remove parakeet linear decomp #17116
• Metal backend: enable linear with bias #17115
• Metal backend: test modules #17076

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/17234

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