Cleaned up Wasm cmake

[Conarnar]

Summary

Before, if dependencies for the API were not enabled in the cmake command, you would get linking errors when trying to compile. Now, if EXECUTORCH_BUILD_WASM is turned on, an error will occur during configure stage if dependencies were not enabled.

Also changed the API to use executorch_kernels rather than hardcoding in portable_ops_lib.

For the unit tests, changed the libraries to PRIVATE instead of PUBLIC and to use --pre-js instead of --post-js as that is the recommended way of interfacing with the Embind Module.

Test plan

bash scripts/build_wasm_tests.sh
cd cmake-out-wasm/extension/wasm/test/
npm test # after installing Jest

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/13106

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❌ 2 New Failures, 1 Unrelated Failure

As of commit 13a5315 with merge base e55bf54 ():

NEW FAILURES - The following jobs have failed:

• Build documentation / build (buck2) / Build doc (gh)
  At least one of the pre-conditions you specified did not hold
• pull / test-moshi-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 8e5166752078489a7f5a6486395a34e3d0e65e08e6c39612a9ba747d97766da3 /exec failed with exit code 1

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

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

• pull / test-openvino-linux / linux-job (gh) (trunk failure)
  AttributeError: '_OpNamespace' 'quantized_decomposed' object has no attribute 'convert_element_type'

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[lucylq]

So executorch_kernels is only built when one of the selective build options is enabled - maybe there should be some documentation indicating that wasm build must use the toplevel selective build API?

[Conarnar]

Actually, if none of the selective build options are used, executorch_kernels will default to optimized_native_cpu_ops_lib if EXECUTORCH_BUILD_KERNELS_OPTIMIZED is turned on, portable_ops_lib otherwise.
https://github.com/pytorch/executorch/blob/main/CMakeLists.txt#L885-L892