feat: Make Reanimated optional (disable Frame Processors if REA v2 is not installed) (#412)

* Fix building iOS without Reanimated

* Conditionally compile Frame Processors (gradle)

* Conditionally use externalNativeBuild

* Remove Reanimated import

* fix: Conditionally load REA/VisionCamera libraries

* fix: Add disable FP to docs

* fix: Fix dummy placeholder for Scheduler.mm

* fix: Fix dummy `Scheduler` declaration

* fix: Only init `CameraView` C++ side if frame processors are enabled

* fix: Install JSI Bindings on Frame Processor Manager ctor

* fix: Wrong conditional

* whoops

android/src/main/java/com/mrousavy/camera/CameraViewModule.kt

@@ -57,10 +57,6 @@ class CameraViewModule(reactContext: ReactApplicationContext) : ReactContextBase
     if (frameProcessorManager == null) {
       frameProcessorThread.execute {
         frameProcessorManager = FrameProcessorRuntimeManager(reactApplicationContext, frameProcessorThread)
-
-        reactApplicationContext.runOnJSQueueThread {
-          frameProcessorManager!!.installJSIBindings()
-        }
       }
     }
   }