Build TS extension against current vscode.d.ts directly

Currently  extensions like TS have a dev dependency on the `"vscode"` package. This pulls in a copy of `vscode.d.ts` that we end up using instead of our local `vscode.d.ts`.

This change uses the `paths` `tsconig` option so that we use our local `vscode.d.ts` instead of the one from `node_modules`

extensions/typescript-language-features/tsconfig.json

@@ -2,9 +2,16 @@
 	"extends": "../shared.tsconfig.json",
 	"compilerOptions": {
 		"outDir": "./out",
-		"experimentalDecorators": true
+		"experimentalDecorators": true,
+		// https://github.com/microsoft/TypeScript/issues/31869#issuecomment-515167432
+		"baseUrl": "src/\u0000",
+		"paths": {
+			"vscode": [
+				"../../../../src/vs/vscode.d.ts"
+			]
+		}
 	},
 	"include": [
 		"src/**/*"
 	]
-}
+}