Enforce vscode and ads version check when installing extensions (#4267)

* engine check when install extension

* gallery install/update and vsix install

* FIX COMMENTS

* Fix the detail not loading issue when version is invalid

* add more comments and adress PR comments

* add install telemetry for install from vsix scenario

* correct the name of the version property for telemetry

samples/sqlservices/package.json

@@ -6,7 +6,7 @@
     "publisher": "demo",
     "engines": {
         "vscode": "^1.26.0",
-        "sqlops": "*"
+        "azdata": "*"
     },
     "categories": [
         "Other"