feat: implement quit event

[Scrumplex]

Description

Closes #204
Closes #217
Closes cinnyapp/cinny#815

See also cinnyapp/cinny#1655

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

[github-actions]

CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

[Scrumplex]

I have read the CLA Document and I hereby sign the CLA

[Scrumplex]

recheck