[5.X] Stray process detection

Kojo will now handle processes orphaned by a SIGKILL of their parent (most notably from kernel's OOMKiller)

What's Changed

• KOJO-243 | Orphaned process detection logic by @mucha55 in #125
• KOJO-242 | Process group awareness by @mucha55 in #124

Full Changelog: 5.4.1...5.5.0