feat(ios): Add cameraId feature to iOS and various bug fixes (#2510)

* Impelement cameraIds for iOS, and various iOS bug fixes.

Summary:

- Implement getCameraIds and cameraId property to manually select a camera device.

- Fix the internal preset being used to properly use a photo and video preset, and check for invalid presets on camera switch.
    - This fixes a bug that would happen after recording. After a recording is complete, the camera preset was set to 4k permanently, and attempting to select any camera that does not support that preset would result in an totally unusable camera. Now, the "Photo" preset is the default which should be the highest quality option for photos, and the previously used "High" preset will be used as video default if no value is provided.
    - This also adds proper support to setting the undocumented "pictureSize" property. Setting this property will change the default photo quality to be that one.

- Minor cleanup to the camera initialization so the same code is not called as many times redundantly (start session / device happening multiple times)
    - The reduced redundant calls to start session and session updates should make the camera startup slightly faster.

- Fix for warnings issued due to misuse of the "isRecording" property. This property was defined as both as a property and a method and was both getting set manually and retrieved with a function. It should now consistently only be retrieved with a function based on the real recording status. Should have no behaivour change, but removes a pesky warning.

- Fix an issue related to the camera getting stuck after a background resume by removing the use of the queue for those two events.

- Fixes a wrong event unsubscription (UIDeviceOrientationDidChangeNotification to UIApplicationDidChangeStatusBarOrientationNotification) from a previous change. Also move event subscriptions to superview changes for consistency and so they are not used/consumed if not needed. After testing, the View of RNCamera is instantiated twice (for some reason I couldn't find) but used only once. RN keeps a reference to the view in memory even after the camera is destroyed, resulting in these events getting fired and handled all the time during the app's lifetime.

* add maxZoom property to iOS.

Android: Not needed as of now. Also, zoom multiplier behaves different on Android and can't be used with the same value as iOS.

docs/RNCamera.md

@@ -277,6 +277,14 @@ Value: float from `0` to `1.0`
 
 Specifies the zoom of your camera. The value 0 is no zoom, 1 is maximum zoom. For a medium zoom, for example, you could pass `0.5`.
 
+### `iOS` `maxZoom`
+
+iOS Only.
+
+Value: optional float greater than `1.0` used to enforce a maximum zoom value on the camera. Setting a value to less than `1` (default) will make the camera use its own max zoom property.
+
+Specifies the max zoom value used in zoom calculations. This is specifically useful for iOS where it reports arbitrary high values and using a 0 to 1 value as the zoom factor is not appropriate.
+
 ### `Android` `permissionDialogTitle` - Deprecated
 
 Starting on android M individual permissions must be granted for certain services, the camera is one of them, you can use this to change the title of the dialog prompt requesting permissions.
@@ -316,7 +324,7 @@ The video stabilization mode used for a video recording. The possible values are
 
 You can read more about each stabilization type here: https://developer.apple.com/documentation/avfoundation/avcapturevideostabilizationmode
 
-### `iOS` `defaultVideoQuality`
+### `defaultVideoQuality`
 
 This option specifies the quality of the video to be taken. The possible values are:
 
@@ -623,9 +631,9 @@ Resumes the preview after pausePreview() has been called.
 
 Android only. Returns a promise. The promise will be fulfilled with an object with an array containing strings with all camera aspect ratios supported by the device.
 
-### `Android` `getCameraIdsAsync(): Promise`
+### `getCameraIdsAsync(): Promise`
 
-Android only. Returns a promise. The promise will be fulfilled with an array containing objects with all camera IDs and type supported by the device.
+Returns a promise. The promise will be fulfilled with an array containing objects with all camera IDs and type supported by the device.
 
 The promise will be fulfilled with an array containing objects with some of the following properties:
 

ios/RN/RNCamera.h

@@ -20,14 +20,16 @@
 @property(nonatomic, strong) AVCaptureMovieFileOutput *movieFileOutput;
 @property(nonatomic, strong) AVCaptureMetadataOutput *metadataOutput;
 @property(nonatomic, strong) AVCaptureVideoDataOutput *videoDataOutput;
-@property(nonatomic, strong) id runtimeErrorHandlingObserver;
 @property(nonatomic, strong) AVCaptureVideoPreviewLayer *previewLayer;
+@property(nonatomic, strong) id runtimeErrorHandlingObserver;
 @property(nonatomic, strong) NSArray *barCodeTypes;
 @property(nonatomic, strong) NSArray *googleVisionBarcodeTypes;
 
 @property(nonatomic, assign) NSInteger presetCamera;
+@property(nonatomic, assign) NSString *cameraId;
 @property(assign, nonatomic) NSInteger flashMode;
 @property(assign, nonatomic) CGFloat zoom;
+@property(assign, nonatomic) CGFloat maxZoom;
 @property(assign, nonatomic) NSInteger autoFocus;
 @property(copy, nonatomic) NSDictionary *autoFocusPointOfInterest;
 @property(assign, nonatomic) float focusDepth;
@@ -37,7 +39,6 @@
 @property(assign, nonatomic) float exposureIsoMax;
 @property(assign, nonatomic) AVCaptureSessionPreset pictureSize;
 @property(nonatomic, assign) BOOL isReadingBarCodes;
-@property(nonatomic, assign) BOOL isRecording;
 @property(nonatomic, assign) BOOL isRecordingInterrupted;
 @property(nonatomic, assign) BOOL isDetectingFaces;
 @property(nonatomic, assign) BOOL canReadText;