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/VisionCameraScheduler.mm

@@ -18,9 +18,9 @@ __attribute__((objc_runtime_name("_TtC12VisionCamera12CameraQueues")))
 @end
 
 namespace vision {
-  
+
 using namespace facebook;
-  
+
 VisionCameraScheduler::VisionCameraScheduler(std::shared_ptr<react::CallInvoker> jsInvoker) {
   this->jsCallInvoker_ = jsInvoker;
 }
@@ -34,6 +34,6 @@ void VisionCameraScheduler::scheduleOnUI(std::function<void()> job) {
 
 VisionCameraScheduler::~VisionCameraScheduler(){
 }
-  
-  
+
+
 } // namespace vision