feat: Implement basic general folder support (#2051)

- Related: #1748

src/cache/types.ts

@@ -0,0 +1,9 @@
+export interface CacheInterface<K, V> {
+  has(k: K): boolean;
+  get(k: K): V | null;
+  set(k: K, v: V): void;
+  delete(k: K): boolean;
+  clear(): void;
+  entries(): MapIterator<[K, V]>;
+  getMatches(predicate: (arg: V) => boolean): V[];
+}