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/CameraView.kt

@@ -26,6 +26,7 @@ import com.facebook.proguard.annotations.DoNotStrip
 import com.facebook.react.bridge.*
 import com.facebook.react.uimanager.events.RCTEventEmitter
 import com.mrousavy.camera.frameprocessor.FrameProcessorPerformanceDataCollector
+import com.mrousavy.camera.frameprocessor.FrameProcessorRuntimeManager
 import com.mrousavy.camera.utils.*
 import kotlinx.coroutines.*
 import kotlinx.coroutines.guava.await
@@ -159,7 +160,7 @@ class CameraView(context: Context, private val frameProcessorThread: ExecutorSer
     }
 
   @DoNotStrip
-  private var mHybridData: HybridData
+  private var mHybridData: HybridData? = null
 
   @Suppress("LiftReturnOrAssignment", "RedundantIf")
   internal val fallbackToSnapshot: Boolean
@@ -192,7 +193,9 @@ class CameraView(context: Context, private val frameProcessorThread: ExecutorSer
     }
 
   init {
-    mHybridData = initHybrid()
+    if (FrameProcessorRuntimeManager.enableFrameProcessors) {
+      mHybridData = initHybrid()
+    }
 
     previewView = PreviewView(context)
     previewView.layoutParams = LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT)