chore: Use structured logging

[bstasyszyn]

Convert all logs to structured logs where data is logged as key-value pairs.

closes #687

Signed-off-by: Bob Stasyszyn Bob.Stasyszyn@securekey.com

[codecov]

Codecov Report

Base: 94.02% // Head: 94.06% // Increases project coverage by +0.04% 🎉

Coverage data is based on head (1fb439a) compared to base (eef47f3).
Patch coverage: 92.97% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #688      +/-   ##
==========================================
+ Coverage   94.02%   94.06%   +0.04%     
==========================================
  Files          77       81       +4     
  Lines        4317     4687     +370     
==========================================
+ Hits         4059     4409     +350     
- Misses        141      160      +19     
- Partials      117      118       +1     

Impacted Files	Coverage Δ
pkg/restapi/common/httputil.go	75.00% <50.00%> (ø)
pkg/versions/1_0/txnprovider/handler.go	91.61% <60.00%> (-0.55%)	⬇️
.../versions/1_0/operationapplier/operationapplier.go	90.14% <81.08%> (-1.40%)	⬇️
pkg/batch/writer.go	91.05% <84.21%> (-0.47%)	⬇️
pkg/versions/1_0/txnprovider/provider.go	97.02% <85.00%> (+<0.01%)	⬆️
pkg/processor/processor.go	93.86% <85.45%> (-1.41%)	⬇️
pkg/observer/observer.go	91.42% <85.71%> (+0.25%)	⬆️
pkg/internal/log/logger.go	96.47% <96.47%> (ø)
pkg/internal/log/fields.go	98.18% <98.18%> (ø)
pkg/batch/cutter/cutter.go	93.10% <100.00%> (+0.37%)	⬆️
... and 9 more

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