Initial implementation of two-way communication with Fabric host (#1622)

* Listen to iframe messages. Test posting message.

* Plug new container message to show New Container dialog

* Rename message action to type

* Fix format

* Fix format

* Remove console.log() statement

* Rework fabric init flow. Implement open Collection Tab from fabric.

* Rename method to better match its purpose

* Update src/hooks/useKnockoutExplorer.ts

Use connectionString from message

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

* Fix format

* For openTab action open first collection if not specified. Clean up FabricContract.

* Reformat FabricContracts

* Highlight current node selection using them token

* Reformat

* Automatically expand nodes in resource tree if underlying database or collection is expanded. Fix AllowedOrigins. Cleanup code.

* Fix format

* Fix lint issue

* Don't show the home screen for Fabric (#1636)

* Fix formatting

* Database name to open can be overridden by value in session storage

---------

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

src/ConfigContext.ts

@@ -61,6 +61,9 @@ let configContext: Readonly<ConfigContext> = {
     `^https:\\/\\/[\\.\\w]*ext\\.azure\\.(com|cn|us)$`,
     `^https:\\/\\/[\\.\\w]*\\.ext\\.microsoftazure\\.de$`,
     `^https:\\/\\/cosmos-db-dataexplorer-germanycentral\\.azurewebsites\\.de$`,
+    `^https:\\/\\/.*\\.fabric\\.microsoft\\.com$`,
+    `^https:\\/\\/.*\\.powerbi\\.com$`,
+    `^https:\\/\\/.*\\.analysis-df\\.net$`,
   ], // Webpack injects this at build time
   gitSha: process.env.GIT_SHA,
   hostedExplorerURL: "https://cosmos.azure.com/",