refactor(tvix/nix-compat): move HashAlgo to separate file

… and keep the pub exports as is.

Change-Id: I2ad21660577553395f05b5ba71083626429b0dfc
Reviewed-on: https://cl.tvl.fyi/c/depot/+/8363
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: flokli <flokli@flokli.de>

tvix/nix-compat/src/lib.rs

@@ -4,6 +4,7 @@ pub mod derivation;
 pub mod nar;
 pub mod nixbase32;
 pub mod nixhash;
+mod nixhash_algos;
 mod nixhash_with_mode;
 pub mod store_path;