kv-storage-polyfill

Polyfill for the proposed kv-storage built-in module (WICG spec), version 2.0.0. Provides a simple key-value storage API similar to the native `std:kv-storage` module for browsers that don't support it yet, with optional import map fallback. It offers an async API similar to IndexedDB but simpler, and uses a shim backed by localStorage or IndexedDB. Works in modern browsers and Node.js (15+), but the native standard is not yet widely implemented.