style(ariadne): place library test next to target

src/ariadne/BUILD

@@ -6,6 +6,12 @@ rust_library(
     srcs = ["lib.rs"],
 )
 
+rust_test(
+    name = "ariadne_lib_test",
+    srcs = ["lib_test.rs"],
+    deps = [":ariadne_lib"],
+)
+
 rust_binary(
     name = "ariadne",
     crate_name = "ariadne_cli",
@@ -13,12 +19,6 @@ rust_binary(
     deps = [":ariadne_lib"],
 )
 
-rust_test(
-    name = "ariadne_lib_test",
-    srcs = ["lib_test.rs"],
-    deps = [":ariadne_lib"],
-)
-
 sh_binary(
     name = "extract_and_decompile",
     srcs = ["extract-and-decompile.sh"],