Move libzip out of the public header

[mattcieslak]

This is an attempt to make it easier to install libtrx as a shared library. It removes libzip references from the public header so that trx-cpp doesn't have to also export libzip

[codecov]

Codecov Report

❌ Patch coverage is 73.91304% with 24 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.64%. Comparing base (f693e7b) to head (23074d1).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/trx.cpp	58.33%	20 Missing ⚠️
include/trx/trx.tpp	69.23%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #46   +/-   ##
=======================================
  Coverage   88.63%   88.64%           
=======================================
  Files          15       15           
  Lines        7736     7749   +13     
  Branches     1042     1043    +1     
=======================================
+ Hits         6857     6869   +12     
- Misses        879      880    +1     

Flag	Coverage Δ
linux	87.83% <75.00%> (+<0.01%)	⬆️
macos	88.47% <74.72%> (+0.01%)	⬆️

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