Add ADS Windows support extension with LaunchSsmsDialog command (#4248)

* ADS Windows support extension with LaunchSsmsDialog command

* Update readme

* Fix spacing

* Update download with new file location and name

* Update SsmsMin package with bits from latest RC build and addressed some comments.

* Update extension name. Add Context menu extension for launching server properties dialog. Remove params interface from public API

* Rename folder and update README

* Correct README title

* Fix a few issues and clean up some stuff.

* Update to azdata namespace

* Refactor to use async/await and add some more telemetry

* Add .bat for running extension tests (currently only Notebook) and set up launch.json with 2 new launch configs for running & debugging extension tests.

* Rename files to make it clear these aren't the integration tests

* Update launch.config too

* Fix spacing and missed file name update

* Fix some bugs in buildSsmsMinCommandArgs and add unit tests

extensions/admin-tool-ext-win/src/config.json

@@ -0,0 +1,12 @@
+{
+    "downloadUrl": "https://sqlopsextensions.blob.core.windows.net/tools/ssmsmin/{#version#}/{#fileName#}",
+    "version": "15.0.18092.0",
+    "downloadFileNames": {
+        "Windows_64": "SsmsMin-15.0.18092.0-win-x64.zip",
+        "Windows_86": "SsmsMin-15.0.18092.0-win-x86.zip"
+    },
+    "installDirectory": "ssmsmin/{#platform#}/{#version#}",
+    "executableFiles": [
+        "SsmsMin.exe"
+    ]
+}