Methods with and without extras

[gdalle]

DI source

For each operator, separate the method with extras and the method without. In other words,

function operator(f, b, x, extras::ExtrasType=prepare_operator(f, b, x))
   # do stuff
end

becomes

function operator(f, b, x, extras::DefaultExtrasType)
   # do stuff
end

function operator(f, b, x)
   return operator(f, b, x, prepare_operator(f, b, x)
end

This allows a more precise dispatch on DefaultExtrasType, and makes the errors more understandable to contributors when they fail to implement one of the 4 operator versions.

DI extensions

• Fix method ambiguity in PolyesterForwardDiff for derivative

DIT source

• Add correctness tests with and without extras (leads to significantly longer tests, especially for Tapir and symbolic backends)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 83.84279% with 74 lines in your changes missing coverage. Please review.

Project coverage is 96.05%. Comparing base (0b7a2f9) to head (4c3bbb0).

Files	Patch %	Lines
...ferentiationInterfaceTest/src/tests/correctness.jl	77.50%	74 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #313      +/-   ##
==========================================
- Coverage   96.32%   96.05%   -0.27%     
==========================================
  Files          95       95              
  Lines        4294     4365      +71     
==========================================
+ Hits         4136     4193      +57     
- Misses        158      172      +14     

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