refactor: move to tools

Author: alexeagle

examples/rust/BUILD.bazel

@@ -1,6 +1,24 @@
 load("@platforms//host:constraints.bzl", "HOST_CONSTRAINTS")
+load("@rules_rust//rust:defs.bzl", "rust_library_group")
 load("@rules_uv//uv:pip.bzl", "pip_compile")
 
+package(default_visibility = ["//tools/toolchains:__pkg__"])
+
+rust_library_group(
+    name = "prost_runtime",
+    deps = [
+        "@crates//:prost",
+    ],
+)
+
+rust_library_group(
+    name = "tonic_runtime",
+    deps = [
+        ":prost_runtime",
+        "@crates//:tonic",
+    ],
+)
+
 pip_compile(
     name = "generate_requirements_txt",
     requirements_in = "requirements.in",

examples/tools/BUILD.bazel

@@ -23,10 +23,10 @@ proto_lang_toolchain(
 rust_prost_toolchain(
     name = "prost_toolchain_impl",
     prost_plugin = "@crates//:protoc-gen-prost__protoc-gen-prost",
-    prost_runtime = "//rust:prost_runtime",
+    prost_runtime = "//tools:prost_runtime",
     prost_types = "@crates//:prost-types",
     tonic_plugin = "@crates//:protoc-gen-tonic__protoc-gen-tonic",
-    tonic_runtime = "//rust:tonic_runtime",
+    tonic_runtime = "//tools:tonic_runtime",
 )
 
 toolchain(