Merge pull request #774 from immutable/feat/sdk-347-ios-attribution-define-gate

fix(audience-sdk): gate iOS attribution providers behind AUDIENCE_MOBILE_ATTRIBUTION (SDK-347)

Author: nattb8

src/Packages/Audience/Runtime/Unity/AudienceUnityHooks.cs

@@ -35,7 +35,7 @@ private static void Install()
             ImmutableAudience.LaunchContextProvider = () => launchProps;
             ImmutableAudience.ContextProvider = () => contextProps;
 
-#if UNITY_IOS && !UNITY_EDITOR
+#if UNITY_IOS && !UNITY_EDITOR && AUDIENCE_MOBILE_ATTRIBUTION
             ImmutableAudience.MobileAttributionProvider = () => SkanRegistration.RegisterIfFirstLaunch();
             ImmutableAudience.MobileAttributionContextProvider = () => AttributionContext.Capture();
             ImmutableAudience.TrackingAuthorizationRequestProvider = () => ATTBridge.RequestAsync();