Summary

This PR adds a new query-string storage driver that enables storing data directly in URL query parameters. This is particularly useful for creating shareable and bookmarkable application states.

Features

• Automatic serialization/deserialization: Handles various data types (strings, numbers, booleans, objects, arrays)
• Browser history integration: Support for pushState/replaceState to control browser navigation
• SSR compatibility: Works with URL objects in Node.js/SSR environments
• Configurable base prefix: Avoid query parameter conflicts with other parts of your application
• URL length warnings: Warns when approaching browser URL length limits
• Watch functionality: Listen to browser navigation events for reactive updates

Use Cases

• E-commerce filters that can be shared via URL
• Dashboard configurations that persist in the URL
• Server-side rendering with state in query parameters
• Any application state that benefits from being bookmarkable

Example Usage

import { createStorage } from "unstorage";
import queryStringDriver from "unstorage/drivers/query-string";

const storage = createStorage({
  driver: queryStringDriver({ 
    base: "app",
    updateHistory: true 
  }),
});

// URL: https://example.com/page
await storage.setItem("filter", "active");
// URL becomes: https://example.com/page?app_filter=active

Test plan

• Unit tests for all driver operations
• Integration tests with the standard driver test suite
• Manual testing in browser environment
• SSR compatibility testing with URL objects

Resolve #668