Run Wasm LSP with async import

vscode-ext/src/extension.ts

@@ -1,4 +1,3 @@
-import { LanguageServer } from "kerolox-lsp";
 import { Readable, Writable } from "stream";
 import * as vscode from "vscode";
 import { LanguageClient, LanguageClientOptions, ServerOptions } from "vscode-languageclient/node";
@@ -23,7 +22,7 @@ export async function activate(context: vscode.ExtensionContext) {
 
 export function launchLsp(output: vscode.OutputChannel): ServerOptions {
   return async () => {
-    output.appendLine("Creating language server");
+    const { LanguageServer } = await import("kerolox-lsp");
     const server = new LanguageServer();
     output.appendLine("Language server created");
     const writer = Writable.fromWeb(server.requests);