feat(backend): setters for each event field

[0xLucqs]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 89.79592% with 5 lines in your changes missing coverage. Please review.

Project coverage is 77.27%. Comparing base (9e00b8c) to head (0ec8231).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...kend/lib/peach_web/controllers/event_controller.ex	83.33%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #2      +/-   ##
==========================================
+ Coverage   69.81%   77.27%   +7.46%     
==========================================
  Files          17       17              
  Lines         106      154      +48     
==========================================
+ Hits           74      119      +45     
- Misses         32       35       +3     

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[0xChqrles]

as an Elixir expert, it lgtm ! Well Done Lucqs