Set default batch size to 1

[gdalle]

Versions

• Bump DI to v0.5.7

DI source

• Set default batch size to 1 for backends that don't overload it

DI extensions

• Set default Enzyme batch size to 16 until Implement pick_batchsize EnzymeAD/Enzyme.jl#1545 is merged. For some reason it failed with 1

DI tests

• Group internal backend tests, add a test for pick_batchsize there

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.33%. Comparing base (ff529cb) to head (c82d488).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #340      +/-   ##
==========================================
- Coverage   96.77%   95.33%   -1.44%     
==========================================
  Files         101      100       -1     
  Lines        4831     4828       -3     
==========================================
- Hits         4675     4603      -72     
- Misses        156      225      +69     

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