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

ios/Frame Processor/FrameProcessorRuntimeManager.mm

@@ -25,6 +25,7 @@
       #import <RNReanimated/RuntimeManager.h>
       #import <RNReanimated/RuntimeDecorator.h>
       #import <RNReanimated/REAIOSErrorHandler.h>
+      #import "VisionCameraScheduler.h"
       #define ENABLE_FRAME_PROCESSORS
     #else
       #warning Your react-native-reanimated version is not compatible with VisionCamera, Frame Processors are disabled. Make sure you're using reanimated 2.2.0 or above!
@@ -36,7 +37,6 @@
 
 #import "FrameProcessorUtils.h"
 #import "FrameProcessorCallback.h"
-#import "VisionCameraScheduler.h"
 #import "../React Utils/MakeJSIRuntime.h"
 #import "../React Utils/JSIUtils.h"
 
@@ -153,7 +153,7 @@ __attribute__((objc_runtime_name("_TtC12VisionCamera10CameraView")))
 
       dispatch_async(CameraQueues.frameProcessorQueue, [=]() {
         NSLog(@"FrameProcessorBindings: Converting worklet to Objective-C callback...");
-        
+
         auto& rt = *runtimeManager->runtime;
         auto function = worklet->getValue(rt).asObject(rt).asFunction(rt);