Add an octx package

[komuw]

• It houses context keys used by multiple ong packages.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change

Comparison is base (bc5bc10) 77.59% compared to head (870661d) 77.59%.

❗ Current head 870661d differs from pull request most recent head 41a00a3. Consider uploading reports for the commit 41a00a3 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #246   +/-   ##
=======================================
  Coverage   77.59%   77.59%           
=======================================
  Files          34       34           
  Lines        3156     3156           
=======================================
  Hits         2449     2449           
  Misses        593      593           
  Partials      114      114           

Impacted Files	Coverage Δ
client/client.go	88.78% <ø> (ø)
log/log.go	77.50% <100.00%> (ø)
middleware/trace.go	100.00% <100.00%> (ø)

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