DRAFT: Move to TF iterators

[dirmeier]

The TF iterator is significantly faster than our implementation.

Drawback: how to convert set of batches to iterator, e.g., as used by summary statistic methods).

[codecov]

Codecov Report

Attention: Patch coverage is 71.71053% with 43 lines in your changes are missing coverage. Please review.

Project coverage is 50.36%. Comparing base (f4f43d1) to head (f48f9bf).

Files	Patch %	Lines
sbijax/_src/snass.py	15.00%	17 Missing ⚠️
sbijax/_src/util/data_test.py	75.00%	15 Missing ⚠️
sbijax/_src/snasss.py	25.00%	6 Missing ⚠️
sbijax/_src/snr.py	0.00%	4 Missing ⚠️
sbijax/_src/util/data.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #23      +/-   ##
==========================================
+ Coverage   50.04%   50.36%   +0.32%     
==========================================
  Files          27       29       +2     
  Lines        1247     1245       -2     
==========================================
+ Hits          624      627       +3     
+ Misses        623      618       -5     

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