RUST-1887 Make BindRawBsonRef a little more user-friendly #565
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RUST-1887
This uses the technique described in Alternative Blanket Implementations for a Single Rust Trait to remove the requirement for users to implement the unusual
bind
trait method for custom types if they want to use them inrawdoc!
macros; instead a very small boilerplate impl can now be used. This does complicate the internal type machinery a bit (introduction of a helper trait and some wrapper types for type-level dispatch) but those don't need to be visible and they're well contained.