Rename neutron converter to compiler with backward compatibility

[jirioc]

Summary

A Neutron Converter is renamed to Neutron Compiler. Both code and documentation updated.

Test plan

The converter/compiler is at the heart of NXP's model compilation process. The unit tests would fail in case of failure.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/22556

• 📄 Preview Python docs built from this PR

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❌ 4 New Failures, 1 Unrelated Failure

As of commit f3982fa with merge base c27baa8 ():

NEW FAILURES - The following jobs have failed:

• pull / test-voxtral-realtime-xnnpack-linux / linux-job (gh)
  RuntimeError: Command docker exec -t d8799fcde8079f9d47aa39a5f5b732749680e45532f05ece364218d9e5ac349c /exec failed with exit code 1
• pull / unittest / linux / linux-job (gh)
  pytorch_tokenizers
• pull / unittest-buck / linux / linux-job (gh)
  pytorch_tokenizers
• pull / unittest-editable / linux / linux-job (gh)
  pytorch_tokenizers

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

• pull / test-moshi-linux / linux-job (gh) (matched linux rule in flaky-rules.json)
  E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/libs/libssh/libssh-gcrypt-4_0.9.6-2ubuntu0.22.04.7_amd64.deb 404 Not Found [IP: 91.189.91.82 80]

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[linux-foundation-easycla]

• ❌ - login: @jirioc / name: Jiri Ocenasek. The commit (29132f9, f3982fa) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please visit our EasyCLA portal and chat with our support bot.