feat(logging): Allow configuring logging verbosity level

[garyhodgson]

Summary

Introduces logr library as per #871

I'm not a Go Developer, so apologies if the attempt isn't very go-ish.

I couldn't see a way to use enums for mapping the log level names to logr.Level ints, so I made use of this library: https://hermannm.dev/enumnames

I performed a few manual tests, not sure how unit tests of log output would work.

Checklist

• Tested and/or added tests to validate that the changes work as intended, if applicable.
• Updated documentation in README.md, if applicable.

[TwiN]

Given that you've never written Go before, you're doing excellent work!

[TwiN]

FYI, don't hesitate to let me know if you want me to add something else to the logr library.

[garyhodgson]

Hi. All good suggestions, the changes to logr make it a easier to integrate 👍

As far as suggestions, I can imagine convenience methods such as isDebug() for logr.GetThreshold() == logr.LevelDebug checks would prove useful.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 77.53%. Comparing base (c6ff6ec) to head (6f63289).

Files with missing lines	Patch %	Lines
main.go	0.00%	4 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #872      +/-   ##
==========================================
- Coverage   77.59%   77.53%   -0.06%     
==========================================
  Files          72       72              
  Lines        5775     5779       +4     
==========================================
  Hits         4481     4481              
- Misses       1078     1082       +4     
  Partials      216      216              

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[TwiN]

Suggested change

	logr.Debugf("[watchdog.execute] Monitoring group=%s; endpoint=%s", ep.Group, ep.Name)
	logr.Debugf("[watchdog.execute] Monitoring group=%s; endpoint=%s", ep.Group, ep.Name)

[TwiN]

Suggested change

[g-hodgson-tup]

Hi - requested changes have been pushed.

[TwiN]

Thank you for the contribution!

[TwiN]

@garyhodgson FYI I decided to move log-level to an environment variable - see #895