support int8 scaled embedding bag pattern match

[shiyang-weng]

Fuse dq + embeddingbag => _scaled_embedding_bag
Supported fp8 pattern match on #3406
Support int8 pattern match on this pr

[pytorch-bot]

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✅ You can merge normally! (1 Unrelated Failure)

As of commit 854da9c with merge base 1f9bfd7 ():

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Run Regression Tests / test-nightly (CUDA Nightly, linux.g5.12xlarge.nvidia.gpu, --pre torch --index-url https://downloa... / linux-job (gh) (trunk failure)
  test/test_low_bit_optim.py::TestFSDP2::test_fsdp2

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[Xia-Weiwen]

Thanks.

[pytorch-bot]

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