build(bazel): add first-party Rust wrappers

src/ariadne/BUILD

@@ -1,13 +1,21 @@
-load("@rules_rust//rust:defs.bzl", "rust_binary", "rust_library", "rust_test")
+load("//bazel:rust.bzl", "rust_binary", "rust_library", "rust_module", "rust_test")
+
+rust_module(
+    name = "graph",
+    src = "src/graph.rs",
+)
+
+rust_module(
+    name = "artifact",
+    src = "src/artifact.rs",
+    deps = [":graph"],
+)
 
 rust_library(
     name = "ariadne_lib",
     crate_name = "ariadne",
-    srcs = [
-        "src/artifact.rs",
-        "src/graph.rs",
-        "src/lib.rs",
-    ],
+    src = "src/lib.rs",
+    modules = [":artifact"],
     deps = [
         "//third_party/crates:serde",
         "//third_party/crates:serde_json",
@@ -16,7 +24,7 @@ rust_library(
 
 rust_test(
     name = "ariadne_lib_test",
-    srcs = ["src/lib_test.rs"],
+    src = "src/lib_test.rs",
     deps = [
         ":ariadne_lib",
         "//third_party/crates:serde_json",
@@ -26,7 +34,7 @@ rust_test(
 rust_binary(
     name = "ariadne",
     crate_name = "ariadne_cli",
-    srcs = ["src/main.rs"],
+    src = "src/main.rs",
     deps = [":ariadne_lib"],
 )