refactor(nix-compat): Move serialization machinery into wire.

This groups most `wire` feature gated logic into a single module.
The nix_daemon module will be gated by a feature that adds
nix-compat-derive as a dependency.

All of this is a way to break the crate2nix dependency cycle between
nix-compat and nix-compat-derive(which depends on nix-compat for its
doctests).

Change-Id: I95938a6f280c11967371ff21f8b5a19e6d3d3805
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12761
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>

tvix/store/src/bin/tvix-store.rs

@@ -3,9 +3,9 @@ use clap::Subcommand;
 
 use futures::StreamExt;
 use futures::TryStreamExt;
-use nix_compat::nix_daemon::de::Error;
 use nix_compat::nixhash::CAHash;
 use nix_compat::nixhash::NixHash;
+use nix_compat::wire::de::Error;
 use nix_compat::{path_info::ExportedPathInfo, store_path::StorePath};
 use serde::Deserialize;
 use serde::Serialize;