Encode numpy arrays in sample batch json

[benjeffery]

No description provided.

[benjeffery]

Needs some tests

[codecov]

Codecov Report

Attention: Patch coverage is 54.54545% with 5 lines in your changes missing coverage. Please review.

Project coverage is 93.09%. Comparing base (a080e8f) to head (fe04950).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
tsinfer/inference.py	54.54%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #965      +/-   ##
==========================================
- Coverage   93.16%   93.09%   -0.08%     
==========================================
  Files          18       18              
  Lines        6337     6345       +8     
  Branches     1133     1135       +2     
==========================================
+ Hits         5904     5907       +3     
- Misses        294      298       +4     
- Partials      139      140       +1     

Flag	Coverage Δ
C	93.09% <54.54%> (-0.08%)	⬇️
python	95.43% <54.54%> (-0.11%)	⬇️

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