Add interaction-tracking/subscriptions (#13426)

* Removed enableInteractionTrackingObserver as a separate flag; only enableInteractionTracking is used now

* Added interaction-tracking/subscriptions bundle and split tests

* Added multi-subscriber support

* Moved subscriptions behind feature flag

* Fixed bug with wrap() parameters and added test

* Replaced wrap arrow function

scripts/rollup/bundles.js

@@ -404,6 +404,15 @@ const bundles = [
     global: 'InteractionTracking',
     externals: [],
   },
+
+  {
+    label: 'interaction-tracking-subscriptions',
+    bundleTypes: [NODE_DEV, NODE_PROD, UMD_DEV, UMD_PROD],
+    moduleType: ISOMORPHIC,
+    entry: 'interaction-tracking/subscriptions',
+    global: 'InteractionTrackingSubscriptions',
+    externals: ['interaction-tracking'],
+  },
 ];
 
 // Based on deep-freeze by substack (public domain)

scripts/rollup/modules.js

@@ -21,6 +21,7 @@ const knownGlobals = Object.freeze({
   react: 'React',
   'react-dom': 'ReactDOM',
   'interaction-tracking': 'InteractionTracking',
+  'interaction-tracking/subscriptions': 'InteractionTrackingSubscriptions',
 });
 
 // Given ['react'] in bundle externals, returns { 'react': 'React' }.