Add reactions to meetings

[jonasdeluna]

webkom/lego-webapp#3548

[codecov]

Codecov Report

Base: 88.28% // Head: 88.26% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (2955559) compared to base (5ed8b62).
Patch coverage: 62.50% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3215      +/-   ##
==========================================
- Coverage   88.28%   88.26%   -0.02%     
==========================================
  Files         658      658              
  Lines       20714    20730      +16     
==========================================
+ Hits        18288    18298      +10     
- Misses       2426     2432       +6     

Impacted Files	Coverage Δ
lego/apps/meetings/models.py	83.33% <50.00%> (-5.13%)	⬇️
lego/apps/meetings/serializers.py	95.31% <100.00%> (+0.31%)	⬆️

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[LudvigHz]

LGTM

I see now that the get_reactions_grouped ideally should be done in a query/SQL and not like this in python. Would speed things up a lot :)