perf(form-checkboxes): convert templates to render functions

[tmorehouse]

No description provided.

[codecov-io]

Codecov Report

Merging #1338 into dev will decrease coverage by 0.06%.
The diff coverage is 49.09%.

@@            Coverage Diff            @@
##              dev   #1338      +/-   ##
=========================================
- Coverage   41.56%   41.5%   -0.07%     
=========================================
  Files         130     130              
  Lines        2656    2653       -3     
  Branches      828     824       -4     
=========================================
- Hits         1104    1101       -3     
+ Misses       1207    1197      -10     
- Partials      345     355      +10

Impacted Files	Coverage Δ
src/mixins/form-radio-check.js	61.53% <100%> (+2.16%)	⬆️
src/components/form-checkbox/form-checkbox.js	39.02% <39.02%> (ø)
...rc/components/form-checkbox/form-checkbox-group.js	75% <75%> (ø)

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