feat: New Core/ library (#1975)

Moves everything Camera related into `core/` / `Core/` so that it is better encapsulated from React Native.

Benefits:

1. Code is much better organized. Should be easier for collaborators now, and cleaner codebase for me.
2. Locking is fully atomically as you can now only configure the session through a lock/Mutex which is batch-overridable
    * On iOS, this makes Camera startup time **MUCH** faster, I measured speedups from **1.5 seconds** to only **240 milliseconds** since we only lock/commit once! 🚀 
    * On Android, this fixes a few out-of-sync/concurrency issues like "Capture Request contains unconfigured Input/Output Surface!" since it is now a single lock-operation! 💪 
3. It is easier to integrate VisionCamera outside of React Native (e.g. Native iOS Apps, NativeScript, Flutter, etc)

With this PR, VisionCamera V3 is up to **7x** faster than V2

package/ios/CameraViewManager.swift

@@ -38,6 +38,10 @@ final class CameraViewManager: RCTViewManager {
     #endif
   }
 
+  // TODO: The startRecording() func cannot be async because RN doesn't allow
+  //       both a callback and a Promise in a single function. Wait for TurboModules?
+  //       This means that any errors that occur in this function have to be delegated through
+  //       the callback, but I'd prefer for them to throw for the original function instead.
   @objc
   final func startRecording(_ node: NSNumber, options: NSDictionary, onRecordCallback: @escaping RCTResponseSenderBlock) {
     let component = getCameraView(withTag: node)