Arm backend: Add model-converter and other mlsdk package download option

[YufengShi-dudu]

• Disable mlsdk setup by default because the manifest repo is not yet public.
• To enable mlsdk dependencies, an mlsdk_manifest_url needs to be supplied. This setup is currently intended for internal development only.

Change-Id: I708e3f8c611dfc31b1f9a44212132c1ff7a79e0e

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218

[pytorch-bot]

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✅ You can merge normally! (7 Unrelated Failures)

As of commit a7831d2 with merge base f82c2f0 ():

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / linux / linux-job (gh) (trunk failure)
  devtools/inspector/tests/inspector_utils_test.py::TestInspectorUtils::test_equip_debug_handle_to_export_program_success
• pull / unittest / macos / macos-job (gh) (trunk failure)
  devtools/inspector/tests/inspector_utils_test.py::TestInspectorUtils::test_equip_debug_handle_to_export_program_success
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
  devtools/inspector/tests/inspector_utils_test.py::TestInspectorUtils::test_equip_debug_handle_to_export_program_success
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  devtools/inspector/tests/inspector_utils_test.py::TestInspectorUtils::test_equip_debug_handle_to_export_program_success
• trunk / test-llama-torchao-lowbit / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 134
• trunk / unittest-release / linux / linux-job (gh) (trunk failure)
  devtools/inspector/tests/inspector_utils_test.py::TestInspectorUtils::test_equip_debug_handle_to_export_program_success
• trunk / unittest-release / macos / macos-job (gh) (trunk failure)
  devtools/inspector/tests/inspector_utils_test.py::TestInspectorUtils::test_equip_debug_handle_to_export_program_success

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[robell]

Works as intended on internal workloads - this is fine until the final manifest gets upstream.

[YufengShi-dudu]

Failures are unrelated to this patch.
Ready to merge.

[Sebastian-Larsson]

approved