Refactor explorer config into useKnockoutExplorer hook (#397)

Co-authored-by: Steve Faulkner <stfaul@microsoft.com>

src/applyExplorerBindings.ts

@@ -1,5 +1,4 @@
 import { BindingHandlersRegisterer } from "./Bindings/BindingHandlersRegisterer";
-import { sendMessage } from "./Common/MessageHandler";
 import * as ko from "knockout";
 import Explorer from "./Explorer/Explorer";
 
@@ -10,7 +9,6 @@ export const applyExplorerBindings = (explorer: Explorer) => {
     ko.applyBindings(explorer);
     // This message should ideally be sent immediately after explorer has been initialized for optimal data explorer load times.
     // TODO: Send another message to describe that the bindings have been applied, and handle message transfers accordingly in the portal
-    sendMessage("ready");
     $("#divExplorer").show();
   }
 };