Android: Add Tensor.ones() and Tensor.zeros() factory methods

[shubham0204]

Fixes #15125

Release notes: misc

Summary

• Add implementation and test for a new factory method Tensor.ones() in the android extension

Test plan

The following new JUnit tests were added to verify the behavior of Tensor.ones() in extension/android/executorch_android/src/test/java/org/pytorch/executorch/TensorTest.kt

• testOnes_DTypeIsFloat

cc @kirklandsign @cbilgin

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15388

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 1 New Failure, 5 Unrelated Failures

As of commit 56ec76c with merge base 964515c ():

NEW FAILURE - The following job has failed:

• pull / android / build-llm-demo / linux-job (gh)
  RuntimeError: Command docker exec -t 48c0f2c3e7b0e397df77f7b9af7a2f46f014e761c02f860b918a480b412d64d4 /exec failed with exit code 1

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

• pull / test-setup-linux-gcc / linux-job (gh) (similar failure)
  ##[error]The operation was canceled.

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

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

• pull / test-binary-size-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-openvino-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest / windows / windows-job (gh) (trunk failure)
  backends/xnnpack/test/ops/test_conv1d.py::TestConv1d::test_qs8_conv1d_batchnorm_seq
• pull / unittest-editable / windows / windows-job (gh) (trunk failure)
  backends/xnnpack/test/ops/test_conv1d.py::TestConv1d::test_qs8_conv1d_batchnorm_seq

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[shubham0204]

@pytorchbot label "release notes: misc"

[GregoryComer]

@shubham0204 Thanks for the contribution. Can you fix the java android lint and rebase the PR? If everything looks good, we can merge it shortly.

[shubham0204]

@GregoryComer I have fixed the Java formatting issues in the modified files. The formatting used is google-java-format as described suggested in the failing CI job. Also rebased the branch onto pytorch:main.