Arm backend: Serialise TOSA shape operations

[oscarandersson8218]

Add support for serializing TOSA shape operators introduced in TOSA-1.1 spec. draft.

cc @digantdesai @freddan80 @per @zingo @mansnils @Sebastian-Larsson @robell @rascani

[pytorch-bot]

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❌ 1 New Failure, 1 Pending, 3 Unrelated Failures

As of commit 17bea8a with merge base 87d9b8a ():

NEW FAILURE - The following job has failed:

• pull / test-lora-multimethod-linux / linux-job (gh)
  RuntimeError: Command docker exec -t c98938249588a565b64170798f8e4226c2ef3e1b639bc3042fde83fa40748e2e /exec failed with exit code 1

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• pull / test-llama-runner-qnn-linux (fp32, qnn_16a16w, qnn) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-qnn-testsuite-linux / test-backend-linux (qnn, models) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• trunk / test-llama-runner-qnn-linux (fp32, qnn_16a16w, qnn) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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[zingo]

OK to merge, just double check if any buck2 changes in needed due to the added file

[zingo]

nss fails are unrelated fix ongoing and ok to merge anyway see fix here: #20373
(have not checked if there is more errors)

[oscarandersson8218]

Unrelated failures.