[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

[5.X] Actual PHP8 release

• KOJO-237 | Remove vestigial (and PHP8-incompatible) zend-db dependency

[5.X] Allow Kōjō to run on PHP8

• KOJO-235 | Allow PHP8.0+

[5.X] New Logging Configurations, API AwareInterfaces

• KOJO-224 | Configurable log level for "disabled job type" messages
• KOJO-201 | add API\V1 AwareInterfaces

[5.X] HOTFIX | Temporarily stop spawning the JSCLP process, plus some documentation

• #115
• #106

[4.X] HOTFIX | Temporarily stop spawning the JSCLP process

• #116

[5.X] Safer and cleaner JSCLP process behavior

• KOJO-180 | Clean up Root's Process Pool after JSCLP exit
• KOJO-178 | Guard against full process pool when Root is polling singletons

[4.X] Safer and cleaner JSCLP process behavior

• KOJO-180 | Clean up Root's Process Pool after JSCLP exit
• KOJO-178 | Guard against full process pool when Root is polling singletons

[5.X] Updated Symfony Component dependencies, iterate on JobStateChange model

• Update outdated Symfony Component dependencies
• Add metadata to JSC model

[4.X] Updated Symfony Component dependencies, iterate on JobStateChange model

• Update outdated Symfony Component dependencies
• Add metadata to JSC model