Batched ForwardDiff pushforward

[gdalle]

DI extensions

• Implement batched pushforward in ForwardDiff by extracting all the partials from a Dual number, and converting an array-of-tuples into a tuple-of-arrays
• Fix ForwardDiff chunk choice so that it never exceeds length(x)

DI source

• Add batched operators to FromPrimitive so that they better reflect the underlying backend

DIT source

• Remove function filter in type stability check

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.56%. Comparing base (4390675) to head (f20dfc1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #328      +/-   ##
==========================================
+ Coverage   94.93%   96.56%   +1.63%     
==========================================
  Files          95       96       +1     
  Lines        4557     4625      +68     
==========================================
+ Hits         4326     4466     +140     
+ Misses        231      159      -72     

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