Feature: Tasks (core) (#12184)

* initial

* string sanitize

* hygiene

* build task

* added build task

* hygiene

* initial tasks view

* finished tasks

* add sql carbon tags and undo changes

* remove task message

* fix tasks tests

* removed extension stuff

* add problem matcher

* remove extra space

* undo extension changes

* add problem matcher to mssql

samples/sqlservices/.vscode/tasks.json

@@ -11,4 +11,4 @@
             ]
         }
     ]
-}
+}