Allow writing multiple items for a read item

[yann-eugone]

No description provided.

[codecov]

Codecov Report

Merging #19 (85af371) into 0.x (6f0dbbd) will increase coverage by 0.24%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##                0.x      #19      +/-   ##
============================================
+ Coverage     83.19%   83.44%   +0.24%     
- Complexity      464      475      +11     
============================================
  Files            62       65       +3     
  Lines          1333     1353      +20     
============================================
+ Hits           1109     1129      +20     
  Misses          224      224              

Impacted Files	Coverage Δ
src/batch/src/Job/Item/ExpandProcessedItem.php	100.00% <100.00%> (ø)
src/batch/src/Job/Item/ItemJob.php	100.00% <100.00%> (ø)
...batch/src/Job/Item/Processor/CallbackProcessor.php	100.00% <100.00%> (ø)
.../batch/src/Test/Job/Item/Writer/InMemoryWriter.php	100.00% <100.00%> (ø)

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