Adding more data types to NNArchive

[klemen1999]

Added:

• INT16
• UINT4

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.30%. Comparing base (6bcbb11) to head (7ff2cbc).
Report is 19 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #208      +/-   ##
==========================================
- Coverage   92.33%   92.30%   -0.03%     
==========================================
  Files          79       79              
  Lines        4161     4275     +114     
==========================================
+ Hits         3842     3946     +104     
- Misses        319      329      +10     

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