HAVING support

[jharley]

Adds support for "havings". Snuck in a few linter fixes as well 🙃

Resolves #97

[codecov-commenter]

Codecov Report

Merging #110 (a6cbda9) into main (0c799cf) will increase coverage by 0.86%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #110      +/-   ##
==========================================
+ Coverage   84.76%   85.62%   +0.86%     
==========================================
  Files          25       25              
  Lines        1693     1795     +102     
==========================================
+ Hits         1435     1537     +102     
  Misses        204      204              
  Partials       54       54              

Impacted Files	Coverage Δ
client/query_spec.go	92.59% <100.00%> (+1.48%)	⬆️
client/type_helpers.go	87.50% <100.00%> (+1.78%)	⬆️
honeycombio/data_source_query_specification.go	95.14% <100.00%> (+1.18%)	⬆️
honeycombio/type_helpers.go	100.00% <100.00%> (ø)

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