Output structured logs from Gin

[chrisdoherty4]

This PR changes Gin to output structured logging instead of its console logging available from gin.Logger() middlware.

In changing to our own middleware implementation we've also removed the dependency on github.com/packethost/pkg.

[codecov]

Codecov Report

Merging #279 (b2e5ad9) into main (cdddec4) will not change coverage.
Report is 1 commits behind head on main.
The diff coverage is 100.00%.

❗ Current head b2e5ad9 differs from pull request most recent head 51bc99b. Consider uploading reports for the commit 51bc99b to get more accurate results

@@           Coverage Diff           @@
##             main     #279   +/-   ##
=======================================
  Coverage   77.85%   77.85%           
=======================================
  Files          18       18           
  Lines         429      429           
=======================================
  Hits          334      334           
  Misses         82       82           
  Partials       13       13           

Files Changed	Coverage Δ
internal/http/serve.go	77.27% <100.00%> (ø)

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