Allow partial batches

[arbennett]

Description of proposed changes

This is a simple additional flag that allows for "partial" batches to be returned.

Fixes #123

[codecov]

Codecov Report

Merging #177 (42de55a) into main (1b58f96) will decrease coverage by 0.57%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main     #177      +/-   ##
==========================================
- Coverage   96.04%   95.48%   -0.57%     
==========================================
  Files           6        6              
  Lines         329      332       +3     
  Branches       70       71       +1     
==========================================
+ Hits          316      317       +1     
- Misses          8        9       +1     
- Partials        5        6       +1     

Impacted Files	Coverage Δ
xbatcher/generators.py	93.60% <50.00%> (-1.07%)	⬇️

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[maxrjones]

@arbennett sorry for the very slow response! This is great!

It would be good to include add a test for this functionality before merging. Please let me know if you'd want to add a test or I can push one if you don't have time.