feat!: specify preparation arguments in DIT Scenario

[gdalle]

Warning

Breaking changes in DifferentiationInterfaceTest

Breaking

• Change Scenario type and constructors:
  • Rename tang field to t
  • Remove smaller field
  • Add prep_args named tuple field containing (; x, [t,] contexts) or (; y, x, [t,] contexts)
• Change scenario constructors to accept positional arguments in the same order as the differentiation operators

Not breaking

• Replace random preparation values with zero preparation values to intialize prep_args, remove myzero
• Use prep_args in correctness, benchmark and type stability tests
• Resize preparation during correctness tests when the sizes exist and don't match between scen.x and scen.prep_args.x (resp. y)
• Add include_smaller kwarg to default_scenarios
• Test smaller scenarios only for ForwardDiff, FiniteDiff and core tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.84%. Comparing base (c2bd64f) to head (d970daf).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #786      +/-   ##
==========================================
- Coverage   97.84%   97.84%   -0.01%     
==========================================
  Files         128      128              
  Lines        7707     7693      -14     
==========================================
- Hits         7541     7527      -14     
  Misses        166      166              

Flag	Coverage Δ
DI	98.68% <100.00%> (-0.24%)	⬇️
DIT	95.61% <100.00%> (+0.57%)	⬆️

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