chore: move Code to a submodule (#4990)

* Move Code to a submodule

Closes #4901.

* Base Code cache on hash and re-enable node_modules cache

The current setup appears to only rebuild VS Code if the dependencies
change but we need to rebuild it if anything changes.

I also re-enabled the commented out node_modules caches.  They look like
they should work to me with the submodule method.  I think the problem
occurred because Code itself was being installed in the yarn step.

src/node/constants.ts

@@ -17,7 +17,7 @@ export function getPackageJson(relativePath: string): JSONSchemaForNPMPackageJso
 }
 
 export const rootPath = path.resolve(__dirname, "../..")
-export const vsRootPath = path.join(rootPath, "vendor/modules/code-oss-dev")
+export const vsRootPath = path.join(rootPath, "lib/vscode")
 const PACKAGE_JSON = "package.json"
 const pkg = getPackageJson(`${rootPath}/${PACKAGE_JSON}`)
 const codePkg = getPackageJson(`${vsRootPath}/${PACKAGE_JSON}`) || { version: "0.0.0" }

src/node/main.ts

@@ -31,7 +31,7 @@ export const shouldSpawnCliProcess = (args: UserProvidedArgs): boolean => {
 export const runVsCodeCli = async (args: DefaultedArgs): Promise<void> => {
   logger.debug("Running VS Code CLI")
 
-  // See ../../vendor/modules/code-oss-dev/src/vs/server/node/server.main.js.
+  // See ../../lib/vscode/src/vs/server/node/server.main.js.
   const spawnCli = await loadAMDModule<CodeServerLib.SpawnCli>("vs/server/node/server.main", "spawnCli")
 
   try {

src/node/routes/vscode.ts

@@ -118,7 +118,7 @@ export class CodeServerRouteWrapper {
     const { args } = req
 
     /**
-     * @file ../../../vendor/modules/code-oss-dev/src/vs/server/node/server.main.js
+     * @file ../../../lib/vscode/src/vs/server/node/server.main.js
      */
     const createVSServer = await loadAMDModule<CodeServerLib.CreateServer>("vs/server/node/server.main", "createServer")