FEAT: add mlx serializer

[qinxuye]

What do these changes do?

This PR added MLX array serializers.

Related issue number

Fixes #xxxx

Check code requirements

• tests added / passed (if needed)
• Ensure all linting tests pass

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.56%. Comparing base (d6465c9) to head (b19c173).
Report is 26 commits behind head on main.

❌ Your project status has failed because the head coverage (84.56%) is below the target coverage (90.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #124      +/-   ##
==========================================
- Coverage   88.97%   84.56%   -4.42%     
==========================================
  Files          48       54       +6     
  Lines        4038     4672     +634     
  Branches      770      510     -260     
==========================================
+ Hits         3593     3951     +358     
- Misses        358      616     +258     
- Partials       87      105      +18     

Flag	Coverage Δ
unittests	84.35% <ø> (-4.46%)	⬇️

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