Scaffold out basic markdown language server (#154293)

* Scaffold out basic markdown lsp

This scaffolds out a new markdown language server and then uses it to implement document symbols. After the change, the markdown extension will have the following structure:

- languageService — Where all the LSP language stuff will eventually land
- server — The actual language server. Consumes ` languageService`
- src — The current extension that launches the server and implements VS Code specific functions

* Adding build scripts

* a

* Use language service from github

* Remove ls build scripts

* Bump versions

* Only build ext

* Enable for web

* Fixing for browser

extensions/markdown-language-features/server/.vscode/launch.json

@@ -0,0 +1,33 @@
+{
+	"version": "0.1.0",
+	// List of configurations. Add new configurations or edit existing ones.
+	"configurations": [
+		{
+			"name": "Attach",
+			"type": "node",
+			"request": "attach",
+			"port": 6044,
+			"protocol": "inspector",
+			"sourceMaps": true,
+			"outFiles": ["${workspaceFolder}/out/**/*.js"]
+		},
+		{
+			"name": "Unit Tests",
+			"type": "node",
+			"request": "launch",
+			"program": "${workspaceFolder}/../../../node_modules/mocha/bin/_mocha",
+			"stopOnEntry": false,
+			"args": [
+				"--timeout",
+				"999999",
+				"--colors"
+			],
+			"cwd": "${workspaceFolder}",
+			"runtimeExecutable": null,
+			"runtimeArgs": [],
+			"env": {},
+			"sourceMaps": true,
+			"outFiles": ["${workspaceFolder}/out/**/*.js"]
+		}
+	]
+}