Issue #16159 - RCTImageStoreManager's priority

Summary:
RCTImageStoreManager and RCTBlobManager have the same priority, hence in certain cases, both are able to handle the request, but this causes non-deterministic behavior. Hence increased ImageStoreManager's Priority to 1 and thereby increasing RCTImageLoader's Priority to 2 to prevent similar issue of same priorities.

Issue: #16159
Closes https://github.com/facebook/react-native/pull/16160

Differential Revision: D6017931

Pulled By: shergin

fbshipit-source-id: 91f2737af4f2f97197734b696105e1cdc5683365

Libraries/Image/RCTImageLoader.m

@@ -66,7 +66,7 @@ RCT_EXPORT_MODULE()
 
 - (float)handlerPriority
 {
-    return 1;
+    return 2;
 }
 
 - (id<RCTImageCache>)imageCache

Libraries/Image/RCTImageStoreManager.m

@@ -32,6 +32,11 @@ static NSString *const RCTImageStoreURLScheme = @"rct-image-store";
 
 RCT_EXPORT_MODULE()
 
+- (float)handlerPriority
+{
+    return 1;
+}
+
 - (void)removeImageForTag:(NSString *)imageTag withBlock:(void (^)())block
 {
   dispatch_async(_methodQueue, ^{