Previously, the protocol used a mix of strings and bytes without any consistency.

When we go to multiple platforms, we won't be able to mix encodings of paths anyway.
We don't know this is the right approach, but it at least makes things consistent
and easy to read in the database, on the wire, etc. Really, we should be using entry
ids etc to refer to entries on the wire anyway, but there's a chance this is the
wrong decision.

Co-Authored-By: Nathan Sobo <nathan@zed.dev>