chore: Enforce consistent type imports via @typescript-eslint/consistent-type-imports (#2545)

src/cache/base.ts

@@ -1,4 +1,4 @@
-import { CacheInterface } from './types.js';
+import type { CacheInterface } from './types.js';
 
 export class CacheBase<Key, Value> implements CacheInterface<Key, Value> {
   private _cache: Map<Key, Value>;

src/cache/expiring-cache.ts

@@ -1,5 +1,5 @@
 import { EqualityCache } from './equality-cache';
-import { CacheInterface } from './types';
+import type { CacheInterface } from './types';
 
 interface ExpiringValue<Value> {
   value: Value;