feat: define clean architecture layers and ports

src/application/ports/query-cache-port.js

@@ -0,0 +1,9 @@
+/**
+ * @typedef {{
+ *   read(key: readonly unknown[]): unknown,
+ *   write(key: readonly unknown[], value: unknown): void,
+ *   invalidate(namespace: readonly unknown[]): Promise<void>
+ * }} QueryCachePort
+ */
+
+export {};