message: Javascript: add public javascript BUILD.bazel rule and binary_writer library.
diff: @@ -6,6 +6,20 @@ licenses(["notice"])
  load("@io_bazel_rules_closure//closure:defs.bzl", "closure_js_library", "closure_js_test")
  +closure_js_library(
  + name = "javascript",
  + visibility = ["//visibility:public"],
  + exports = [
  + ":primitives",
  + ":binary_reader",
  + ":binary_writer",
  + ":readers_writers",
  + ":keyset_handle",
  + ":key_manager",
  + ":registry",
  + ],
  +)
  +
  closure_js_library(
  name = "primitives",
  srcs = [
  @@ -35,6 +49,18 @@ closure_js_library(
  ],
  )
  +closure_js_library(
  + name = "binary_writer",
  + srcs = [
  + "binary_keyset_writer.js",
  + ],
  + deps = [
  + ":readers_writers",
  + "//javascript/exception",
  + "@io_bazel_rules_closure//closure/library",
  + ],
  +)
  +
  closure_js_library(
  name = "readers_writers",
  srcs = [
  