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/tsconfig.json

@@ -0,0 +1,22 @@
+{
+	"extends": "../tsconfig.base.json",
+	"compileOnSave": true,
+	"compilerOptions": {
+		"outDir": "./out",
+		"lib": [
+			"es6",
+			"dom"
+		],
+		"emitDecoratorMetadata": true,
+		"experimentalDecorators": true,
+		"strict": false,
+		"noUnusedLocals": false,
+		"noUnusedParameters": false,
+		"noImplicitAny": false,
+		"noImplicitReturns": false,
+		"noImplicitOverride": false
+	},
+	"exclude": [
+		"node_modules"
+	]
+}