feat(tvix/nix-compat-derive): Add deriver for NixDeserialize

This adds a nix-compat-derive derive crate that implements a deriver
for NixDeserialize implementations. This is to reduce the amount of
code needed to implement deserialization for all the types used by
the Nix daemon protocol.

Change-Id: I484724b550e8a1d5e9adad9555d9dc1374ae95c2
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12022
Autosubmit: Brian Olsen <me@griff.name>
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>

tvix/nix-compat-derive-tests/tests/ui/deserialize_remote_missing_attr.rs

@@ -0,0 +1,15 @@
+use nix_compat_derive::nix_deserialize_remote;
+
+pub struct Value(String);
+impl From<String> for Value {
+    fn from(s: String) -> Value {
+        Value(s)
+    }
+}
+
+nix_deserialize_remote!(
+    #[nix()]
+    Value
+);
+
+fn main() {}