Android: add Module lifecycle and API coverage tests

[psiddh]

Add 13 new tests covering previously untested Module public APIs:

• Load modes: MMAP, FILE
• getMethods(): verify returns array containing "forward"
• getMethodMetadata(): verify name and backends
• readLogBuffer() / readLogBufferStatic(): verify non-null
• etdump(): verify callable
• Destroyed-state throws for getMethods, getMethodMetadata, readLogBuffer, etdump
• Double destroy is safe (idempotent)

This commit was authored with the help of Claude.

[pytorch-bot]

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✅ You can merge normally! (2 Unrelated Failures)

As of commit 7a8f8e0 with merge base b8f04aa ():

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 / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest-editable / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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[Copilot]

Pull request overview

Adds Android instrumentation tests to increase coverage of the org.pytorch.executorch.Module public API and lifecycle behavior, ensuring key methods work across load modes and correctly fail after destruction.

Changes:

• Add tests for Module.load() with LOAD_MODE_MMAP and LOAD_MODE_FILE.
• Add tests for getMethods(), getMethodMetadata(), readLogBuffer() / readLogBufferStatic(), and etdump().
• Add destroyed-state and idempotent-destroy tests for the above APIs.

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