fix(camera): Handle 'Limited' iOS Photo permission.

[boutier]

Limited means "we have access to some photos and you can save photos from the application".

Thus, when we give a limited access to the gallery:

• succeed
• save to gallery

In this patch, also add code to check that the switch is exhaustive, such that compilation will fail and we won't forget to handle future cases.

[jcassidyav]

Great catch, but I would prefer if we did not hide the fact that photo permissions were not available, as camera permissions are available for request separately in the scenario where they are not required.

[jcassidyav]

I don't agree with ignoring the failure to get photo permissions, if the user does not want photo permissions ( because they are not saving to the gallery) they do not have to call this method, ignoring the failure removes the ability to inform the user, possibly directing them to enable permissions.

[boutier]

I understand. But:

• I don't like to have a result that relies on the internal implementation (requesting first photos or first permissions)
• I don't like to have a failure without knowing which permission was faulty

So, do we want to have something like @nativescript-community/perms that would return a Promise<MultiResult>.

Or something simpler returning just a boolean (granted or not)

requestCameraPermissions(): Promise<0 | 1>
requestPhotosPermissions(): Promise<0 | 2>
requestPermissions(): Promise<number>
enum TypeFlags {
    Camera = 1,
    Photo = 2,
}