Option to add debug comments

[RangelReale]

In some cases we ignore so many fields, it is hard to keep track of what effectivelly was ignored.

This MR adds an options debug:comments [yes | no] which adds comments for each field ignored / skipped.

func (c *ConverterImpl) Convert(source ignore.Input) ignore.Output {
	var exampleOutput ignore.Output
	exampleOutput.Name = source.Name
	// ignored: exampleOutput.Age
	return exampleOutput
}

func (c *ConverterImpl) Convert(source ignoremissing.Input) ignoremissing.Output {
	var exampleOutput ignoremissing.Output
	exampleOutput.Name = source.Name
	// skipped: exampleOutput.Age
	// skipped: exampleOutput.Street
	return exampleOutput
}

[jmattheis]

Thanks for the PR, I've made some changes.

• Renamed the setting to annotate:unmapped
• add comment for unexported ignored fields
• add docs + tests

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.96%. Comparing base (a7d0f0f) to head (f0c03d2).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #226      +/-   ##
==========================================
+ Coverage   95.95%   95.96%   +0.01%     
==========================================
  Files          50       50              
  Lines        2743     2754      +11     
==========================================
+ Hits         2632     2643      +11     
  Misses         80       80              
  Partials       31       31              

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