feat(scaffolding): add Rust package generator

tools/scaffolding/BUILD

@@ -0,0 +1,27 @@
+load("@rules_rust//rust:defs.bzl", "rust_binary", "rust_library", "rust_test")
+
+rust_library(
+  name = "rust",
+  crate_name = "rust",
+  srcs = [
+    "rust.rs",
+    "rust_test.rs",
+  ],
+  compile_data = glob(["templates/*"]),
+)
+
+rust_test(
+  name = "rust_test",
+  crate = ":rust",
+)
+
+rust_binary(
+  name = "rust_cli",
+  crate_name = "rust_cli",
+  srcs = [
+    "rust_main.rs",
+  ],
+  deps = [
+    ":rust",
+  ],
+)