Debug bound on calls and queries

[cwlittle]

[mappum]

This will also involve deriving Debug on all built-in explicitly-created Call/Query types, and emitting the Debug derive or impl in macro-generated Call/Query implementations.

It's unclear if we can reasonably assume everything inside calls and queries will already have Debug since it will apply to every parameter of every call method - we may need to emit custom Debug implementations which use a placeholder output for types inside variants which are not Deubg (based on specialization, similar to our maybe_call wrappers).