Refactor custom SDPA op to separate kv cache update from the custom sdpa op

[kimishpatel]

Stack from ghstack (oldest at bottom):

• [Executorch][quant] Optimize per channel dequantize #5656
• [Executorch][llama] Add custom_sdpa and use that instead of sdpa_with_kv_cache #5655
• [Executorch] Update EXECUTORCH_LIBRARY macro #5654
• [Executorch][llama] Refactoring sdpa #5653
• [Executorch][llama] Update SDPA op to use quantized kv cache #5652
• Add update_quantized_cache op #5527
• -> Refactor custom SDPA op to separate kv cache update from the custom sdpa op #5651
• [ExecuTorch] Add quantized kv cache to llama #5650
• Fix dequantize per channel to handle double scale type #5524
• [ExecuTorch] Some updated to kv cache #5649

Differential Revision: D62301837

[pytorch-bot]

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❌ 6 New Failures

As of commit 87832e5 with merge base d2ba238 ():

NEW FAILURES - The following jobs have failed:

• pull / test-llama-runner-linux (bf16, buck2, portable) / linux-job (gh)
  RuntimeError: Command docker exec -t 4fbb44b67e444a9609a27facd1516cbb74cf36e5113168a1cac807fa8296b49c /exec failed with exit code 3
• pull / test-llama-runner-linux (fp32, buck2, portable) / linux-job (gh)
  RuntimeError: Command docker exec -t a985c1c494e10aa2a8727e4f2fbd7f814bbb2fc068d9003b99dddeb7136f0583 /exec failed with exit code 3
• pull / test-llama-runner-linux (fp32, buck2, xnnpack+custom) / linux-job (gh)
  RuntimeError: Command docker exec -t d2e04415a1da4a1b76f391f840d29af3b72d5e4fb676a495ac80088e8d617f7d /exec failed with exit code 3
• pull / test-llama-runner-linux (fp32, buck2, xnnpack+custom+qe) / linux-job (gh)
  RuntimeError: Command docker exec -t 48a079ba8775b1d464e8ff360752c99fe68585527762b90a47b3ac27de198ca3 /exec failed with exit code 3
• pull / unittest / linux / linux-job (gh)
  kernels/quantized/test/test_quant_dequant_per_token.py::QuantizePerTokenTest::test_quantize_per_token_high_rank
• pull / unittest / macos / macos-job (gh)
  kernels/quantized/test/test_quant_dequant_per_token.py::QuantizePerTokenTest::test_quantize_per_token_large_tensor

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[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D62301837

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D62301837