Added support for quantized_softmax in ref_implementations

[skrtskrtfb]

Summary: Add support for quantized_softmax ref implementation

Reviewed By: DrJessop

Differential Revision: D85188129

[pytorch-bot]

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✅ You can merge normally! (1 Unrelated Failure)

As of commit 7ba6162 with merge base 94def70 ():

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

• pull / test-models-linux-basic (mv3, portable, buck2, linux.2xlarge, executorch-ubuntu-22.04-clang12) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is canceled.

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[meta-codesync]

@skrtskrtfb has exported this pull request. If you are a Meta employee, you can view the originating Diff in D85188129.

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