Push scalability (#3080)

* Update status through increment
* adds support for incrementing nested keys
* fix issue when having spaces in keys for ordering
* Refactors PushController to use worker
* Adds tests for custom push queue config
* Makes PushController adapter independant
* Better logging of _PushStatus in VERBOSE

src/Controllers/AdaptableController.js

@@ -38,11 +38,15 @@ export class AdaptableController {
   }
 
   validateAdapter(adapter) {
+    AdaptableController.validateAdapter(adapter, this);
+  }
+
+  static validateAdapter(adapter, self, ExpectedType) {
     if (!adapter) {
       throw new Error(this.constructor.name + " requires an adapter");
     }
 
-    const Type = this.expectedAdapterType();
+    const Type = ExpectedType || self.expectedAdapterType();
     // Allow skipping for testing
     if (!Type) {
       return;