Add support for fusing Conv+ReLU

[mcremon-meta]

Summary:
This diff adds support for implicitly fusing Conv2d+ReLU

We add a new pattern which will capture this sequence of events and ensure the subgraph is treated as one node during calculation of qparam.

Then, during fuse, we replace this subgraph with just the conv and drop the ReLU.

Reviewed By: ethansfng, hsharma35

Differential Revision: D79381533

[pytorch-bot]

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

As of commit b918df8 with merge base 233063c ():

NEW FAILURE - The following job has failed:

• pull / unittest-editable / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_add.py::TestAdd::test_fp32_add_constant

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

• pull / test-openvino-linux / 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 / unittest / macos / macos-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: D79381533

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@mcremon-meta has exported this pull request. If you are a Meta employee, you can view the originating diff in D79381533.