feat(tvix/derivation): add nix drv path generation to Derivation

This adds a function to generate the derivation path. The computation
is based on the Go implementation.

Change-Id: Iae89db4976f5fd9208f0453f73688689a245cd66
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7729
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>

tvix/derivation/Cargo.toml

@@ -8,6 +8,8 @@ edition = "2021"
 [dependencies]
 glob = "0.3.0"
 serde = { version = "1.0", features = ["derive"] }
+sha2 = "0.10.6"
+tvix-store-bin = { path = "../store" }
 
 [dev-dependencies.test-generator]
 # This fork of test-generator adds support for cargo workspaces, see
@@ -17,3 +19,4 @@ rev = "82e799979980962aec1aa324ec6e0e4cad781f41"
 
 [dev-dependencies]
 serde_json = "1.0"
+test-case = "2.2.2"