feat: Android SDK update for version 30.0.0 - #143

A minor request-serialization bug remains: Client.flatten collapses nested arrays of strings.

This update aligns the Android SDK with Appwrite 2.5 response shapes and adds the corresponding service and model APIs. It also adds query-builder support, OAuth2 resource and state options, passkey and analytics APIs, and push notification options with refreshed documentation and examples.