Add RNCallKeepCheckReachability event on ios

Author: manuquentin

ios/RNCallKeep/RNCallKeep.m

@@ -32,6 +32,7 @@
 static NSString *const RNCallKeepPerformPlayDTMFCallAction = @"RNCallKeepDidPerformDTMFAction";
 static NSString *const RNCallKeepDidToggleHoldAction = @"RNCallKeepDidToggleHoldAction";
 static NSString *const RNCallKeepProviderReset = @"RNCallKeepProviderReset";
+static NSString *const RNCallKeepCheckReachability = @"RNCallKeepCheckReachability";
 
 @implementation RNCallKeep
 {
@@ -90,7 +91,8 @@ - (void)dealloc
         RNCallKeepDidPerformSetMutedCallAction,
         RNCallKeepPerformPlayDTMFCallAction,
         RNCallKeepDidToggleHoldAction,
-        RNCallKeepProviderReset
+        RNCallKeepProviderReset,
+        RNCallKeepCheckReachability
     ];
 }