Add custom event manager

[elias-knodel]

Description

More detailed description in the linked issue

Related issue

Resolves #85

[codecov]

Codecov Report

Attention: Patch coverage is 0.93458% with 318 lines in your changes are missing coverage. Please review.

Project coverage is 23.52%. Comparing base (1a74815) to head (fa26d21).
Report is 74 commits behind head on main.

❗ Current head fa26d21 differs from pull request most recent head 9e10c16. Consider uploading reports for the commit 9e10c16 to get more accurate results

Files	Patch %	Lines
components/events/message_action.go	0.00%	176 Missing ⚠️
components/events/command.go	0.00%	80 Missing ⚠️
api/slash_commands.go	1.92%	51 Missing ⚠️
components/events/events.go	15.38%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #92      +/-   ##
==========================================
- Coverage   26.32%   23.52%   -2.81%     
==========================================
  Files          78       80       +2     
  Lines        3533     3809     +276     
==========================================
- Hits          930      896      -34     
- Misses       2591     2901     +310     
  Partials       12       12              

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