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

build/npm/dirs.js

@@ -21,6 +21,7 @@ exports.dirs = [
 	'extensions/configuration-editing',
 	'extensions/dacpac',
 	'extensions/data-workspace',
+	'extensions/datavirtualization',
 	'extensions/git',
 	'extensions/git-base',
 	'extensions/github',