Delete vscode-typescript upon close of VS Code (#73801)

* Cleans up vs-typescript temp directoy upon VS code close

* Fixed typing errors preventing build from succeeding

* Moved deletion to the deactivate method. Added folders per extension host

* Removed yarn watch script used in testing

extensions/typescript-language-features/package.json

@@ -17,13 +17,15 @@
   ],
   "dependencies": {
     "jsonc-parser": "^2.0.1",
+    "rimraf": "^2.6.3",
     "semver": "5.5.1",
     "vscode-extension-telemetry": "0.1.1",
     "vscode-nls": "^4.0.0"
   },
   "devDependencies": {
-    "@types/node": "8.0.33",
+    "@types/node": "^12.0.2",
     "@types/semver": "^5.5.0",
+    "@types/rimraf": "2.0.2",
     "vscode": "^1.1.10"
   },
   "scripts": {
@@ -750,4 +752,4 @@
       }
     ]
   }
-}
+}