Fabric: clean up RPC and support show/hide toolbar message (#1680)

* Use Promise for allResourceToken fabric message. Cleanup token message handling and add debounce.

* Improve rpc and update initalization flow

* Fix format

* Rev up message names for new version

* Refactor RPC with Fabric

* Build fix

* Fix build

* Fix format

* Update Message types

* Fix format

* Fix comments

* Fabric toolbar style and support to show/hide it (#1720)

* Add Fabric specific Toolbar design

* Add Fabric message to show/hide the Toolbar

* Fix CommandBarUtil formatting

* Update zustand state on setToolbarStatus to trigger a redraw of the command bar with updated visibility

---------

Co-authored-by: Laurent Nguyen <laurent.nguyen@microsoft.com>

* Fix format

---------

Co-authored-by: Vsevolod Kukol <sevoku@microsoft.com>

src/Contracts/DataExplorerMessagesContract.ts

@@ -0,0 +1,42 @@
+import { MessageTypes } from "./MessageTypes";
+
+// This is the current version of these messages
+export const DATA_EXPLORER_RPC_VERSION = "2";
+
+// Data Explorer to Fabric
+
+// TODO Remove when upgrading to Fabric v2
+export type DataExploreMessageV1 =
+  | "ready"
+  | {
+      type: MessageTypes.GetAuthorizationToken;
+      id: string;
+      params: GetCosmosTokenMessageOptions[];
+    }
+  | {
+      type: MessageTypes.GetAllResourceTokens;
+      id: string;
+    };
+// -----------------------------
+
+export type DataExploreMessageV2 =
+  | {
+      type: MessageTypes.Ready;
+      id: string;
+      params: [string]; // version
+    }
+  | {
+      type: MessageTypes.GetAuthorizationToken;
+      id: string;
+      params: GetCosmosTokenMessageOptions[];
+    }
+  | {
+      type: MessageTypes.GetAllResourceTokens;
+      id: string;
+    };
+
+export type GetCosmosTokenMessageOptions = {
+  verb: "connect" | "delete" | "get" | "head" | "options" | "patch" | "post" | "put" | "trace";
+  resourceType: "" | "dbs" | "colls" | "docs" | "sprocs" | "pkranges";
+  resourceId: string;
+};