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.m

@@ -0,0 +1,30 @@
+//
+//  Frame.m
+//  VisionCamera
+//
+//  Created by Marc Rousavy on 08.06.21.
+//  Copyright © 2021 mrousavy. All rights reserved.
+//
+
+#import "Frame.h"
+#import <Foundation/Foundation.h>
+#import <CoreMedia/CMSampleBuffer.h>
+
+@implementation Frame {
+  CMSampleBufferRef buffer;
+  UIImageOrientation orientation;
+}
+
+- (instancetype) initWithBuffer:(CMSampleBufferRef)buffer orientation:(UIImageOrientation)orientation {
+  self = [super init];
+  if (self) {
+    _buffer = buffer;
+    _orientation = orientation;
+  }
+  return self;
+}
+
+@synthesize buffer = _buffer;
+@synthesize orientation = _orientation;
+
+@end