feat: add validate address helper

[kyranjamie]

This helper function's repeated over a few repos. I figure this library's the most appropriate place to put it.

[codecov]

Codecov Report

Merging #102 into master will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #102      +/-   ##
==========================================
+ Coverage   84.01%   84.07%   +0.05%     
==========================================
  Files          28       28              
  Lines        1802     1808       +6     
  Branches      367      367              
==========================================
+ Hits         1514     1520       +6     
  Misses        286      286              
  Partials        2        2              

Impacted Files	Coverage Δ
src/utils.ts	78.48% <100.00%> (+1.76%)	⬆️

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[zone117x]

PR looks good, but wondering if you could do a bit more by adding an isValid32Address function to the c32check lib? This avoids the relatively expensive process from a throw/try/catch. It's a bit of a micro-optimization but could see it as a useful ddos prevention measure for certain projects.