Currently (as @dzmitry-huba pointed out), it is too easy to mix and match dependencies so that a crate ends up with multiple versions of prost that are incompatible with each other.

We should consider re-exporting prost (and maybe even prost-derive) from our own crates (not sure which ones? maybe micro_rpc, maybe others), and use the re-exported versions instead of adding a direct dependency on prost from the application crate.