feat: native Frame type to provide Orientation (#186)

* Use Frame.h

* Add orientation

* Determine buffer orientation

* Replace plugins

* fix calls

* Update FRAME_PROCESSOR_CREATE_PLUGIN_IOS.mdx

* Update FRAME_PROCESSOR_CREATE_PLUGIN_IOS.mdx

* format

* Update CameraPage.tsx

* Update FRAME_PROCESSOR_CREATE_PLUGIN_IOS.mdx

* Add links to docs

* Use `.` syntax

* Make properties `readonly`

* Fix `@synthesize` backing store

ios/Frame Processor/Frame.h

@@ -0,0 +1,22 @@
+//
+//  Frame.h
+//  VisionCamera
+//
+//  Created by Marc Rousavy on 15.03.21.
+//  Copyright © 2021 mrousavy. All rights reserved.
+//
+
+#pragma once
+
+#import <Foundation/Foundation.h>
+#import <CoreMedia/CMSampleBuffer.h>
+#import <UIKit/UIImage.h>
+
+@interface Frame : NSObject
+
+- (instancetype) initWithBuffer:(CMSampleBufferRef)buffer orientation:(UIImageOrientation)orientation;
+
+@property (nonatomic, readonly) CMSampleBufferRef buffer;
+@property (nonatomic, readonly) UIImageOrientation orientation;
+
+@end