refactor(rust): share workspace path resolution

Cargo.lock

@@ -57,6 +57,7 @@ name = "ariadne"
 version = "0.1.0"
 dependencies = [
  "clap",
+ "monorepo-util",
  "serde",
  "serde_json",
 ]
@@ -135,6 +136,10 @@ version = "2.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf8baf1c55e62ffcace7a9f06f4bd9cd3f0c4beb022d3b367256b91b87513d98"
 
+[[package]]
+name = "monorepo-util"
+version = "0.1.0"
+
 [[package]]
 name = "once_cell_polyfill"
 version = "1.70.2"