Implement Sample data import for Fabric Home (#2101)

* Implement dialog to import sample data

* Fix format

* Cosmetic fixes

* fix: update help link to point to the new documentation URL

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

src/Explorer/DataSamples/DataSamplesUtil.ts

@@ -6,6 +6,7 @@ import Explorer from "../Explorer";
 import { useDatabases } from "../useDatabases";
 import { ContainerSampleGenerator } from "./ContainerSampleGenerator";
 
+// TODO: this does not seem to be used. Remove?
 export class DataSamplesUtil {
   private static readonly DialogTitle = "Create Sample Container";
   constructor(private container: Explorer) {}