feat: xlog auto debug in development mode

[sysulq]

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[codecov-commenter]

Codecov Report

Merging #304 (586212e) into master (97a81e4) will increase coverage by 0.76%.
The diff coverage is 51.85%.

@@            Coverage Diff             @@
##           master     #304      +/-   ##
==========================================
+ Coverage   29.50%   30.26%   +0.76%     
==========================================
  Files          93       93              
  Lines        6463     6426      -37     
==========================================
+ Hits         1907     1945      +38     
+ Misses       4425     4347      -78     
- Partials      131      134       +3     

Impacted Files	Coverage Δ
pkg/xlog/trace.go	0.00% <ø> (ø)
pkg/xlog/log.go	56.86% <25.00%> (+29.54%)	⬆️
pkg/xlog/context.go	56.52% <56.52%> (ø)
pkg/xlog/api.go	47.05% <0.00%> (+43.13%)	⬆️

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