Add zip_test

[nhz2]

This PR adds and exports:

zip_test(r::ZipReader)::Nothing

Test all entries in the archive in order from 1 to zip_nentries(r)
Throw an error for the first invalid entry.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.74%. Comparing base (45d03bc) to head (8a9beee).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #73   +/-   ##
=======================================
  Coverage   99.74%   99.74%           
=======================================
  Files           6        6           
  Lines         782      789    +7     
=======================================
+ Hits          780      787    +7     
  Misses          2        2           

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