Give the gate, the window and the pending map one owner

src/unanswered-error.ts

@@ -0,0 +1,7 @@
+/** The request went out and no answer came back: the peer may have accepted it. */
+export class UnansweredError extends Error {
+	constructor(cause: Error) {
+		super(`No answer came back, so the peer may have accepted it: ${cause.message}`, { cause });
+		this.name = 'UnansweredError';
+	}
+}