Add a bindings-only version of Future::register_callback
#1737
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While we could, in theory, add support to the bindings logic to map
Box<dyn Trait>
, there isn't a whole lot of use doing so when its incredibly trivial to do directly.This adds a trivial wrapper around
Future::register_callback
that is only built in bindings and which is linked in theregister_callback
docs for visibility.