add in record audio on AI glasses snippets

[trambui09]

Add in code snippets to record audio on AI glasses via:

1. Bluetooth HFP
2. Projected context

[snippet-bot]

Here is the summary of changes.

You are about to add 2 region tags.

• xr/src/main/java/com/example/xr/projected/ProjectedHardware.kt:178, tag androidxr_bluetooth_audio_record
• xr/src/main/java/com/example/xr/projected/ProjectedHardware.kt:216, tag androidxr_projected_context_audio_record

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[gemini-code-assist]

Code Review

This pull request adds audio recording functionality for Bluetooth HFP and projected device contexts. The review identifies several issues: a potential null-pointer exception when using the audio manager, resource leaks from unreleased AudioRecord instances, and a lack of error handling for buffer size initialization which could lead to runtime crashes.

[devbridie]

Thanks!