Qualcomm AI Engine Direct - Merge the two pybind libraries into a single library

[shewu-quic]

Summary:

• Prevent dynamic_cast failures caused by separate typeinfo in each library with clang.

cc: @haowhsu-quic

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15999

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❌ 2 New Failures, 3 Pending, 2 Unrelated Failures

As of commit 9b4866c with merge base 1864fb0 ():

NEW FAILURES - The following jobs have failed:

• pull / unittest-editable / linux / linux-job (gh)
  backends/xnnpack/test/ops/test_conv2d.py::TestConv2d::test_qs8_conv2d_bn
• trunk / test-arm-backend (test_pytest_ops_ethosu_fvp) / linux-job (gh)
  RuntimeError: Command docker exec -t 10e86d46cd90afa9a2c9b9a1fa1f067dd052f10013de217bb4fbb2766707e52e /exec failed with exit code 1

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

• pull / unittest / linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• trunk / test-arm-backend (test_run_ethosu_fvp) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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[shewu-quic]

Hi @cccclai
This PR addresses the dynamic_cast failure encountered with clang in this issue #15734
I will split Qualcomm AI Engine Direct - Support PARSeq in floating point precision into a few PRs.

Could you take a look at this when you have a moment?

Thanks

[shewu-quic]

@pytorchbot label "release notes: qualcomm"

[cccclai]

It seems like a pretty big change and I just recently disable qnn pybind test #15949. Let's make sure it passes internal test and the qnn related CI..