[camera] Implement setDescription with android camerax

[blackorbs-dev]

setDescription allows switching camera while a video recording is in progress. This feature was only working with camera2 setup, but the camera plugin uses camerax by default. So, this PR includes update to address the issue.

Fixes #148013

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[gemini-code-assist]

Code Review

This pull request implements the ability to switch cameras (setDescription) while a video is recording on Android when using CameraX. This is achieved by introducing a new enablePersistentRecording parameter to the startVideoRecording method. When enabled, the recording session persists through camera switches and lifecycle events. The changes include updating the CameraController to handle this new parameter, adding relevant documentation, and modifying an integration test to verify that recording continues uninterrupted when the camera is switched.

[gemini-code-assist]

Setting enablePersistentRecording to true by default changes the existing behavior of video recording. As the documentation states, a persistent recording will ignore events that would normally stop it, such as lifecycle events. This is a behavioral breaking change for users who might be relying on the previous behavior.

For a patch release, it's best to avoid such breaking changes. I recommend changing the default value to false to make this new persistent recording behavior opt-in. This maintains backward compatibility, and developers who need to switch cameras during recording can explicitly enable it.

If you apply this change, please remember to update the integration test in packages/camera/camera/example/integration_test/camera_test.dart to explicitly call startVideoRecording(enablePersistentRecording: true) to ensure the test for the new functionality continues to pass.

Suggested change

	bool enablePersistentRecording = true,
	bool enablePersistentRecording = false,

[blackorbs-dev]

@bparrishMines please review