feat: add processedStream on create camera track

[italomiguelpinheiro]

Summary by CodeRabbit

Release Notes

• New Features
  • Camera track creation now supports optional pre-processed video streams, providing enhanced flexibility for video processing workflows.

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📝 Walkthrough

Walkthrough

Updated the LocalVideoTrack.createCameraTrack method signature to accept an optional rtc.MediaStream? processedStream parameter. When provided, this processed stream is used instead of creating a new one via LocalTrack.createStream(options).

Changes

Cohort / File(s)	Summary
LocalVideoTrack API Enhancement lib/src/track/local/video.dart	Added optional processedStream parameter to createCameraTrack(). Stream selection now uses provided processedStream via null coalescing operator (??) if available; otherwise falls back to LocalTrack.createStream(options).

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰✨ A stream flows freely, yet now with choice,
Pre-processed or fresh—let callers rejoice!
With just a small param, flexibility's gained,
The video track's flexibility well-maintained! 🎬

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📜 Recent review details

Configuration used: defaults

Review profile: CHILL

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📥 Commits

Reviewing files that changed from the base of the PR and between 70d4d1f and f2b8702.

📒 Files selected for processing (1)

• lib/src/track/local/video.dart

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