feat: Code Scanner API (#1912)

* feat: CodeScanner JS API

* feat: iOS

* Use guard

* Format

* feat: Android base

* fix: Attach Surfaces

* Use isBusy var

* fix: Use separate Queue

* feat: Finish iOS types

* feat: Implement all other code types on Android

* fix: Call JS event

* fix: Pass codetypes on Android

* fix: iOS use Preview coordinate system

* docs: Add comments

* chore: Format code

* Update CameraView+AVCaptureSession.swift

* docs: Add Code Scanner docs

* docs: Update

* feat: Use lazily downloaded model on Android

* Revert changes in CameraPage

* Format

* fix: Fix empty QR codes

* Update README.md

package/ios/Types/CodeScanner.swift

@@ -0,0 +1,45 @@
+//
+//  CodeScanner.swift
+//  VisionCamera
+//
+//  Created by Marc Rousavy on 03.10.23.
+//  Copyright © 2023 mrousavy. All rights reserved.
+//
+
+import AVFoundation
+import Foundation
+
+class CodeScanner {
+  let codeTypes: [AVMetadataObject.ObjectType]
+  let interval: Int
+  let regionOfInterest: CGRect?
+
+  init(fromJsValue dictionary: NSDictionary) throws {
+    if let codeTypes = dictionary["codeTypes"] as? [String] {
+      self.codeTypes = try codeTypes.map { value in
+        return try AVMetadataObject.ObjectType(withString: value)
+      }
+    } else {
+      throw CameraError.parameter(.invalidCombination(provided: "codeScanner", missing: "codeTypes"))
+    }
+
+    if let interval = dictionary["interval"] as? Double {
+      self.interval = Int(interval)
+    } else {
+      interval = 300
+    }
+
+    if let regionOfInterest = dictionary["regionOfInterest"] as? NSDictionary {
+      guard let x = regionOfInterest["x"] as? Double,
+            let y = regionOfInterest["y"] as? Double,
+            let width = regionOfInterest["width"] as? Double,
+            let height = regionOfInterest["height"] as? Double else {
+        throw CameraError.parameter(.invalid(unionName: "regionOfInterest", receivedValue: regionOfInterest.description))
+      }
+
+      self.regionOfInterest = CGRect(x: x, y: y, width: width, height: height)
+    } else {
+      regionOfInterest = nil
+    }
+  }
+}