build: add utility for reading build event protocol

Author: alexeagle

third_party/github.com/bazelbuild/bazel/src/main/java/com/google/devtools/build/lib/buildeventstream/proto/BUILD

@@ -0,0 +1,9 @@
+package(default_visibility = ["//:__subpackages__"])
+
+licenses(["notice"])  # Apache 2.0
+
+proto_library(
+    name = "proto",
+    srcs = glob(["*.proto"]),
+    deps = ["//third_party/github.com/bazelbuild/bazel/src/main/protobuf"],
+)