add orderBy param

[michaelabbott25]

adding the orderBy param that way it's reusable and consistent if/when we add new endpoints that use ordering. this is similar to how we handle paging.

[InfernoJJ]

I would get rid of the semi-confusing exists boolean being returned. We make all the values lowercase kabob formatted. So createdOn to created-on etc... This helps our customers who are developing against the platform to avoid mistakes.

LGTM otherwise!

[codecov-commenter]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (ed4abd5) 76.11% compared to head (e52f4f4) 76.78%.

❗ Current head e52f4f4 differs from pull request most recent head e1d2fd3. Consider uploading reports for the commit e1d2fd3 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #324      +/-   ##
==========================================
+ Coverage   76.11%   76.78%   +0.66%     
==========================================
  Files          28       28              
  Lines        1005     1034      +29     
==========================================
+ Hits          765      794      +29     
  Misses        178      178              
  Partials       62       62              

Files	Coverage Δ
http/server.go	100.00% <100.00%> (ø)

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