feat: add makeWASocketAutoVersion for automatic version fetching

Adds a new async function that automatically fetches the latest
WhatsApp Web version from web.whatsapp.com before connecting.

Usage:
```typescript
// Option 1: Auto-fetch version (recommended)
const sock = await makeWASocketAutoVersion({ auth: state })

// Option 2: Manual version (existing behavior)
const sock = makeWASocket({ auth: state })
```

Benefits:
- No need to update library for version changes
- Automatic fallback to bundled version if fetch fails
- Logged warnings when using fallback

src/index.ts

@@ -1,4 +1,4 @@
-import makeWASocket from './Socket/index'
+import makeWASocket, { makeWASocketAutoVersion } from './Socket/index'
 
 export * from '../WAProto/index.js'
 export * from './Utils/index'
@@ -9,5 +9,5 @@ export * from './WAM/index'
 export * from './WAUSync/index'
 
 export type WASocket = ReturnType<typeof makeWASocket>
-export { makeWASocket }
+export { makeWASocket, makeWASocketAutoVersion }
 export default makeWASocket