Run CLANGFORMAT on plugins

Summary:
This diff runs CLANGFORMAT lint on plugins. I have added CLANGFORMAT as the lint engined for objc files in xplat/sonar. Right now the iOS folder is not formatted according to CLANGFORMAT.

Ran `arc lint -a --paths-cmd "find ./iOS/Plugins -type f" --verbose`

Reviewed By: passy

Differential Revision: D19942173

fbshipit-source-id: 8b975b0a344df073b02d69cd1f9ee5629af2799d

iOS/Plugins/FlipperKitLayoutPlugin/FlipperKitLayoutComponentKitSupport/SKSubDescriptor.mm

@@ -10,15 +10,15 @@
 #import "SKSubDescriptor.h"
 #import "SKComponentLayoutWrapper.h"
 
-@implementation SKSubDescriptor
-{
+@implementation SKSubDescriptor {
 }
 
-- (NSDictionary<NSString *, NSObject *> *)getDataForNode:(SKComponentLayoutWrapper *)node {
+- (NSDictionary<NSString*, NSObject*>*)getDataForNode:
+    (SKComponentLayoutWrapper*)node {
   return @{};
 }
 
-- (NSString *)getName {
+- (NSString*)getName {
   return @"";
 }