Support dtype option in StaticAttentionIOManager

[sxu]

Summary: Specify dtype used when creating inputs which are used for export. Needed for CoreML export which uses fp16.

Differential Revision: D78494128

[pytorch-bot]

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❌ 1 New Failure, 2 Unrelated Failures

As of commit a6a5a82 with merge base c75e37a ():

NEW FAILURE - The following job has failed:

• pull / test-eval_llama-mmlu-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 61bd132c43aec5ca9829fab6fda4ea44318205b90aab10dd1ce8f5e61cd817f5 /exec failed with exit code 1

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

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

• pull / unittest / linux / linux-job (gh) (trunk failure)
  backends/xnnpack/test/ops/test_to_copy.py::TestChannelsLastTaggedReshapePass::test_quantized_to_copy
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
  backends/xnnpack/test/ops/test_to_copy.py::TestChannelsLastTaggedReshapePass::test_quantized_to_copy

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[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D78494128

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