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

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

* Fix format

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

less/documentDBFabric.less

@@ -47,11 +47,15 @@ a:focus {
   border-radius: @FabricBoxBorderRadius;
   box-shadow: @FabricBoxBorderShadow;
   margin: @FabricBoxMargin;
+  margin-top: 0px;
   padding-top: 2px;
+  padding: 0px;
+  height: 40px;
 }
 
 .dividerContainer {
   padding: @SmallSpace 0px @SmallSpace 0px;
+  height: @FabricCommandBarButtonHeight;
   .flex-display();
 
   span {