feature/event privacy + fix eventview error

[imimouni]

3 levels of event privacy- 'Public' - can be shown by anyone 'Private' - for other users - The event start date end date and owner is shown all other details are 'private' or not shown 'Hidden' - can only be seen by owner, the event will not be shown to anyone other than the owner

small fix in eventview function - a '?' was missing between 'event_id' and 'messages=' in the routing link.

[codecov-io]

Codecov Report

Merging #271 (29c5173) into develop (44563e8) will increase coverage by 0.01%. The diff coverage is 96.22%.

@@             Coverage Diff             @@
##           develop     #271      +/-   ##
===========================================
+ Coverage    98.23%   98.25%   +0.01%     
===========================================
  Files           70       72       +2     
  Lines         3010     3155     +145     
===========================================
+ Hits          2957     3100     +143     
- Misses          53       55       +2     

Impacted Files	Coverage Δ
app/routers/event.py	96.55% <95.23%> (-0.34%)	:arrow_down:
app/database/models.py	96.80% <100.00%> (+0.03%)	:arrow_up:
app/internal/calendar_privacy.py	100.00% <100.00%> (ø)
app/internal/privacy.py	100.00% <100.00%> (ø)
app/routers/profile.py	92.79% <100.00%> (+0.06%)	:arrow_up:
app/internal/statistics.py	100.00% <0.00%> (ø)

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