Replace manual plugin py_binary creation with py_console_script_binary for grpclib

Author: aaliddell

modules/python/BUILD.bazel

@@ -1,4 +1,6 @@
 load("@rules_proto_grpc//:defs.bzl", "proto_plugin")
+load("@rules_proto_grpc_python_pip_deps//:requirements.bzl", "requirement")
+load("@rules_python//python/entry_points:py_console_script_binary.bzl", "py_console_script_binary")
 load("@rules_python//python/pip_install:requirements.bzl", "compile_pip_requirements")
 
 compile_pip_requirements(
@@ -33,9 +35,18 @@ proto_plugin(
     visibility = ["//visibility:public"],
 )
 
+py_console_script_binary(
+    name = "grpclib_plugin_bin",
+    pkg = requirement("grpclib"),
+    script = "protoc-gen-grpclib_python",
+    deps = [
+        requirement("protobuf"),
+    ],
+)
+
 proto_plugin(
     name = "grpclib_plugin",
     outputs = ["{protopath|python}_grpc.py"],
-    tool = "//grpclib:plugin",
+    tool = "//:grpclib_plugin_bin",
     visibility = ["//visibility:public"],
 )