Add event tracer support for channelwise gated

[JakeStevens]

Summary:
Because multi-output out-variant custom ops cannot use the EXECUTORCH_LIBRARY macro, we manually register and did not add even tracer support.

This diff adds that support

It also moves the gated delta tests to its own file.

Differential Revision: D113603106

[pytorch-bot]

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❌ 6 New Failures, 1 Unrelated Failure

As of commit da759bd with merge base 30bf6af ():

NEW FAILURES - The following jobs have failed:

• Cadence Build & Test / hifi-build / hifi4 (gh)
  Refusing to check out fork pull request code from a 'pull_request_target' workflow. This workflow runs with the base repository's GITHUB_TOKEN, secrets, default-branch cache scope, and runner access. Fetching and executing a fork's code in that trusted context commonly leads to "pwn request" vulnerabilities. To opt in, review the risks at https://gh.io/securely-using-pull_request_target and set 'allow-unsafe-pr-checkout: true' on the actions/checkout step.
• Cadence Build & Test / vision-build / vision (gh)
  Refusing to check out fork pull request code from a 'pull_request_target' workflow. This workflow runs with the base repository's GITHUB_TOKEN, secrets, default-branch cache scope, and runner access. Fetching and executing a fork's code in that trusted context commonly leads to "pwn request" vulnerabilities. To opt in, review the risks at https://gh.io/securely-using-pull_request_target and set 'allow-unsafe-pr-checkout: true' on the actions/checkout step.
• pull / unittest / linux / linux-job (gh)
  extension/llm/custom_ops/test_gated_delta.py::ChannelwiseGatedDeltaRuleTest::test_channelwise_gated_delta_rule_pte_execution
• pull / unittest-buck / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 9e11716f7b25980424d0f9ffe6ccb29567f257df9d2099e48b37adb5696225fd /exec failed with exit code 3
• pull / unittest-buck / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 3
• pull / unittest-editable / linux / linux-job (gh)
  extension/llm/custom_ops/test_gated_delta.py::ChannelwiseGatedDeltaRuleTest::test_channelwise_gated_delta_rule_pte_execution

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / test-models-linux-basic (mv3, portable, cmake, linux.2xlarge, executorch-ubuntu-22.04-clang12) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128

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[meta-codesync]

@JakeStevens has exported this pull request. If you are a Meta employee, you can view the originating Diff in D113603106.

[github-actions]

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