feature: Badge field

[mihaimdm22]

I think this is complete and we can merge. Open for feedback as well! Let's discuss in the long meeting we ll have.

[codecov]

Codecov Report

Merging #66 into master will increase coverage by 0.14%.
The diff coverage is 99.11%.

@@            Coverage Diff             @@
##           master      #66      +/-   ##
==========================================
+ Coverage   95.30%   95.45%   +0.14%     
==========================================
  Files          75       77       +2     
  Lines        1533     1605      +72     
==========================================
+ Hits         1461     1532      +71     
- Misses         72       73       +1     

Impacted Files	Coverage Δ
lib/avocado/app/fields/badge_field.rb	95.00% <95.00%> (ø)
lib/avocado/app/fields/belongs_to.rb	97.14% <100.00%> (-0.08%)	⬇️
lib/avocado/app/fields/boolean_field.rb	100.00% <100.00%> (ø)
lib/avocado/app/fields/boolean_group_field.rb	100.00% <100.00%> (ø)
lib/avocado/app/fields/date_field.rb	100.00% <100.00%> (ø)
lib/avocado/app/fields/datetime_field.rb	100.00% <100.00%> (ø)
lib/avocado/app/fields/field.rb	98.27% <100.00%> (+0.16%)	⬆️
lib/avocado/app/fields/file_field.rb	80.95% <100.00%> (ø)
lib/avocado/app/fields/files_field.rb	80.00% <100.00%> (ø)
lib/avocado/app/fields/has_and_belongs_to_many.rb	95.83% <100.00%> (-0.17%)	⬇️
... and 16 more

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[adrianthedev]

Just a few things to do here.