privy-provider-refactor.md

@fuels/react	minor
@fuel-connectors/common	patch

refactor: Move Privy provider to @fuels/react package

• Add PrivyInternalProvider component for managing Privy app initialization and configuration
• Add PrivyEventsWatcher component for monitoring Privy authentication state changes
• Implement PrivyAuthObserver for subscribing to Privy login/logout events
• Add Privy type definitions and configuration constants to @fuels/react
• Export Privy types from @fuel-connectors/common: PrivyAuthEventTypes enum and IPrivyAuthObserver interface
• Simplify FuelProvider to conditionally render Privy providers based on socialLogin configuration
• Improve provider hierarchy and separation of concerns