Brands API endpoint

[ujh]

First endpoint of the new JSON API. Super simple, as it just returns brand names.

[ujh]

Relates to #1361

[codecov]

Codecov Report

Base: 62.96% // Head: 63.40% // Increases project coverage by +0.43% 🎉

Coverage data is based on head (3ecaa36) compared to base (586aee0).
Patch coverage: 93.33% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1387      +/-   ##
==========================================
+ Coverage   62.96%   63.40%   +0.43%     
==========================================
  Files         145      147       +2     
  Lines        2954     2962       +8     
  Branches       94       94              
==========================================
+ Hits         1860     1878      +18     
+ Misses       1085     1075      -10     
  Partials        9        9              

Flag	Coverage Δ
javascript	27.60% <ø> (ø)
ruby	79.07% <93.33%> (+0.56%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
app/controllers/brands_controller.rb	33.33% <0.00%> (+9.80%)	⬆️
app/controllers/api/v1/base_controller.rb	100.00% <100.00%> (ø)
app/controllers/api/v1/brands_controller.rb	100.00% <100.00%> (ø)
app/models/brand_cluster.rb	64.28% <0.00%> (+3.57%)	⬆️
app/serializers/brand_cluster_serializer.rb	100.00% <0.00%> (+100.00%)	⬆️

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