fix(cacache): export getCacache function

Make getCacache() publicly accessible for external use by cache-with-ttl's getAll() method.

Changes:
- Export getCacache() function in src/cacache.ts

Author: jdalton

src/cacache.ts

@@ -41,7 +41,7 @@ export interface RemoveOptions {
 /**
  * Get the cacache module for cache operations.
  */
-function getCacache() {
+export function getCacache() {
   return /*@__PURE__*/ require('./external/cacache')
 }