PTY keepalive pings and Android sandbox class removal

Daytona 0.222.0 removes the android sandbox class from the API client, keeps PTY sessions alive with WebSocket pings, and cleans up temp files after downloads in the Go SDK and CLI.

Features

API client: remove the android sandbox class

Fixes

SDK: send WebSocket keepalive pings on PTY sessions

Go SDK, CLI: remove temp files left behind by file and recording downloads

Chores

Go SDK: bump to v0.222.0