Lookahead decoding on static attention

[sxu]

Summary: Implement reference lookahead decoding in StaticAttentionIOManager.

Differential Revision: D76741091

[pytorch-bot]

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❌ 1 New Failure, 1 Cancelled Job, 1 Unrelated Failure

As of commit f8b7ae9 with merge base 3c33d29 ():

NEW FAILURE - The following job has failed:

• pull / test-eval_llama-mmlu-linux / linux-job (gh)
  RuntimeError: Dataset scripts are no longer supported, but found mmlu_no_train.py

CANCELLED JOB - The following job was cancelled. Please retry:

• pull / test-models-linux (mobilebert, portable, linux.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.

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

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

• pull / test-models-linux (mobilebert, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D76741091

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D76741091

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D76741091