Added a duration (in ms) to club events to allow for the determination of an end time.

[github-actions[bot]]

File	Coverage
All files	73%	:x:
src/__init__.py	96%	:white_check_mark:
src/__main__.py	85%	:white_check_mark:
src/api/auth.py	41%	:x:
src/api/categories.py	21%	:x:
src/api/club_events.py	97%	:white_check_mark:
src/api/email_verification.py	35%	:x:
src/api/events.py	34%	:x:
src/api/groups.py	27%	:x:
src/api/hackers.py	82%	:white_check_mark:
src/common/decorators.py	88%	:white_check_mark:
src/common/json.py	80%	:white_check_mark:
src/common/mail.py	75%	:white_check_mark:
src/models/user.py	82%	:white_check_mark:

Minimum allowed coverage is 75%

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