Promote time zone aware attributes to a first class type decorator
This refactoring revealed the need for another form of decoration, which takes a proc to select which it applies to (There's a *lot* of cases where this form can be used). To avoid duplication, we can re-implement the old decoration in terms of the proc-based decoration. The reason we're `instance_exec`ing the matcher is for cases such as time zone aware attributes, where a decorator is defined in a parent class, and a method called in the matcher is overridden by a child class. The matcher will close over the parent, and evaluate in its context, which is not the behavior we want.
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