move builtin commands out of list.ts into their own files

src/components/client/shell/command/builtin/ls.ts

@@ -0,0 +1,11 @@
+import type { Args, Term } from "../list";
+
+export default function ls(term: Term, args: Args): boolean {
+	// if (args[1] === undefined) {
+	// 	for (const dir_name in working_dir) {
+
+	// 	}
+	// 	return <p>{`${working_dir}`}</p>
+	// }
+	return true
+}