feat(examples): add p/printfdebugging

[moul]

Extracted from #2551.

See #2551 (comment).

Contributors' checklist...

• Added new tests, or not needed, or not feasible
• Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• Updated the official documentation or not needed
• No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• Added references to related issues and PRs
• Provided any useful hints for running manual tests
• Added new benchmarks to generated graphs, if any. More info here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.87%. Comparing base (5503cca) to head (2bc08cb).
Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2809      +/-   ##
==========================================
+ Coverage   60.83%   60.87%   +0.04%     
==========================================
  Files         563      563              
  Lines       75193    75235      +42     
==========================================
+ Hits        45743    45802      +59     
+ Misses      26076    26067       -9     
+ Partials     3374     3366       -8     

Flag	Coverage Δ
contribs/gnodev	61.46% <ø> (ø)
contribs/gnofaucet	14.46% <ø> (ø)
gno.land	67.17% <ø> (ø)
gnovm	65.63% <ø> (ø)
misc/genstd	80.54% <ø> (ø)
misc/logos	19.88% <ø> (-0.36%)	⬇️
tm2	62.07% <ø> (+0.18%)	⬆️

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[thehowl]

This is silly, until it isn't

Do you think it makes more sense maybe under p/moul?