feat: verifySignature function

[Villaquiranm]

related to #2777

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 60.44%. Comparing base (68b8f54) to head (707ba33).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2776   +/-   ##
=======================================
  Coverage   60.44%   60.44%           
=======================================
  Files         563      563           
  Lines       75157    75157           
=======================================
+ Hits        45426    45430    +4     
+ Misses      26341    26340    -1     
+ Partials     3390     3387    -3     

Flag	Coverage Δ
contribs/gnodev	61.46% <ø> (ø)
contribs/gnofaucet	14.46% <ø> (-0.86%)	⬇️
gno.land	67.21% <ø> (ø)
misc/genstd	80.54% <ø> (ø)
misc/logos	20.23% <ø> (ø)
tm2	62.07% <ø> (+0.08%)	⬆️

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