Add datavirtualization extension (#21594)

* initial

* cleanup

* Add typings ref

* fix compile

* remove unused

* add missing

* another unused

* Use newer vscodetestcover

* newer dataprotocol

* format

* cleanup ignores

* fix out path

* fix entry point

* more cleanup

* Move into src folder

* Handle service client log messages

* remove unused

extensions/datavirtualization/coverConfig.json

@@ -0,0 +1,23 @@
+{
+	"enabled": true,
+	"relativeSourcePath": "..",
+	"relativeCoverageDir": "../../coverage",
+	"ignorePatterns": [
+		"**/node_modules/**",
+		"**/libs/**",
+		"**/lib/**",
+		"**/htmlcontent/**/*.js",
+		"**/*.bundle.js",
+		"**/markdown-language-features/**",
+		"**/media/*.js"
+	],
+	"includePid": false,
+	"reports": [
+		"json"
+	],
+	"verbose": false,
+	"remapOptions": {
+		"basePath": "../..",
+		"useAbsolutePaths": true
+	}
+}