FRE-600: Fix code review blockers

- Consolidated duplicate UndoManagers to single instance
- Fixed connection promise to only resolve on 'connected' status
- Fixed WebSocketProvider import (WebsocketProvider)
- Added proper doc.destroy() cleanup
- Renamed isPresenceInitialized property to avoid conflict

Co-Authored-By: Paperclip <noreply@paperclip.ing>

node_modules/style-to-object/index.d.ts

@@ -0,0 +1,38 @@
+/**
+ * Parses inline style to object.
+ *
+ * @example
+ * import StyleToObject from 'style-to-object';
+ * StyleToObject('line-height: 42;');
+ */
+declare function StyleToObject(
+  style: string,
+  iterator?: StyleToObject.Iterator
+): { [name: string]: string } | null;
+
+export = StyleToObject;
+
+declare namespace StyleToObject {
+  interface DeclarationPos {
+    line: number;
+    column: number;
+  }
+
+  // declaration is an object from module `inline-style-parser`
+  interface Declaration {
+    type: string;
+    property: string;
+    value: string;
+    position: {
+      start: DeclarationPos;
+      end: DeclarationPos;
+      source: any;
+    };
+  }
+
+  type Iterator = (
+    property: string,
+    value: string,
+    declaration: Declaration
+  ) => void;
+}