Add AutoChainRules(ruleconfig) #21
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Checklist
contributor guidelines, in particular the SciML Style Guide and
COLPRAC.
Additional context
This PR adds an
AutoChainRulesAD type. It is built from aRuleConfigto allow calling back into AD withfrule_via_adorrrule_via_ad(see https://juliadiff.org/ChainRulesCore.jl/stable/rule_author/superpowers/ruleconfig.html).It does not inherit from
AbstractForwardModeorAbstractReverseModebecause it can be both.A similar pattern was used in AbstractDifferentiation.jl
https://github.com/JuliaDiff/AbstractDifferentiation.jl/blob/2bc18d07eb5038c997a7f9253bc3f1457124710e/src/backends.jl#L64-L66