Mute Audio Default Setting

[Kimblebee]

Persistent setting to start video recordings muted or with audio.

notable changes:

• injectable PermissionChecker helper class. It has access to application context for the sole purpose of verifying that a permission has been granted.
• The permission to record audio is used as a constraint for the Mute Audio setting -- It will be disabled if the permission is not granted
• Same process of adding a new setting...

[temcguir]

In the currently used version of CameraX, you can now start a recording muted with PendingRecording.withAudioEnabled(initialMuted = true). Maybe you can add that to this PR?

https://developer.android.com/reference/androidx/camera/video/PendingRecording#withAudioEnabled(kotlin.Boolean)

[temcguir]

So I tried to research this a little, and from what I can tell, the permissions are supposed to be fully owned by the UI layer. We should treat them as if they are user interaction events, like pressing a button. With that in mind, we should check permissions in the UI (Activity or Screen level) and send them down to the ViewModel, where the ViewModel can generate the UiState that depends on them.

So the SettingsViewModel should have something like:

class SettingsViewModel {
    fun setAudioPermissionGranted(granted: Boolean)
}

or if you need multiple permissions to be communicated to the ViewModel:

class SettingsViewModel {
    fun setGrantedPermissions(permissions: Set<String>)
}

This will align with the guidance that:

whereas currently, this code is storing a Context (albeit an Application context) in the ViewModel, which violates this guidance.