Android: add RecordOptions.fps support when using Camera2Api

[tamnnn]

Adding Android Camera2 support for controlling fps through recordAsync(). The key for this to work was setting CaptureRequest.CONTROL_AE_TARGET_FPS_RANGE.

Along with this, I made an attempt at implementing Camera2.getSupportedPreviewFpsRange() by making it into a wrapper call around mCameraCharacteristics.get(CameraCharacteristics.CONTROL_AE_AVAILABLE_TARGET_FPS_RANGES). I'm not sure if this is desired, and I mainly only did this to keep consistent with Camera1, so feel free to tell me to revert it.

Test Devices:

• Pixel 4: cameraType: 'front', 'back'; cameraId: '2' (NIR)
• Pixel 5: cameraType: 'front', 'back'
• iPhone XS: cameraType: 'front', 'back'