Implement similar structure we have in Java plugin.

Reviewed By: lblasa

Differential Revision: D48172579

fbshipit-source-id: b2127507b04cdb85f426313e71405a81103e42bd

iOS/Plugins/FlipperKitDatabasesPlugin/FlipperKitDatabasesPlugin/FlipperKitDatabasesPlugin.h

@@ -8,7 +8,11 @@
 #import <FlipperKit/FlipperPlugin.h>
 #import <Foundation/Foundation.h>
 
+@class DatabasesManager;
+
 @interface FlipperKitDatabasesPlugin : NSObject<FlipperPlugin>
+@property(nonatomic, strong) DatabasesManager* databasesManager;
+
 - (instancetype)init NS_UNAVAILABLE;
 + (instancetype)sharedInstance;