log.go: Export log color codes

[TerraTech]

This gives an application to manipulate the color codes. This was done because the default for SeverityInfo (blue) was difficult to read when displayed on a console black background.

In my case, I'm swapping out SeverityInfo blue with cyan color ("\033[36m") which makes its log output much easier to read.

On a different branch, I'm defining colors for:

1. ColorBlue
2. ColorBlueBold
3. ColorCyan

but those little color helpers are not in this PR in order to keep it tightly focused to the original. If you want me to include them, your can look at my FQdevel branch and I can fold that into this PR. I just didn't know if you wanted any extra noise in this submission.

[TerraTech]

Upon further reflection, I changed SeverityInfo blue to ColorBlueBold in the FQdevel branch.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.75%. Comparing base (6fec769) to head (81901c0).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #592   +/-   ##
=======================================
  Coverage   85.75%   85.75%           
=======================================
  Files          39       39           
  Lines        2282     2282           
=======================================
  Hits         1957     1957           
  Misses        300      300           
  Partials       25       25           

Flag	Coverage Δ
micro	85.75% <100.00%> (ø)

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[raphael]

This is great, thank you! I'm wondering if we could add an option e.g. WithColors that would let users customize the colors in a convenient way? That could be a separate PR.