feat(tvix/cli): add errors module with drv construction errors

These will be threaded through to eval through the new `TvixError`
variant.

Change-Id: Ia0d3f8710dcf26bb95015cd2a6a2b2911f06343f
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7842
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI

tvix/Cargo.nix

@@ -6857,6 +6857,10 @@ rec {
             name = "smol_str";
             packageId = "smol_str";
           }
+          {
+            name = "tvix-derivation";
+            packageId = "tvix-derivation";
+          }
           {
             name = "tvix-eval";
             packageId = "tvix-eval";