Attribute Macro aggregator::tuxedo_constraint_checker

#[tuxedo_constraint_checker]

This macro treats the supplied enum as an aggregate constraint checker. As such, it implements the From trait for eah of the inner types. Then it implements the ConstraintChecker trait for this type for this enum by delegating to an inner type.

It also declares an associated error type. The error type has a variant for each inner constraint checker, just like this original enum. however, the contained values in the error enum are of the corresponding types for the inner constraint checker.