Bazel: Add fixes for --incompatible_load_java_rules_from_bzl

Change-Id: If9c9a400e9151a74e730785e2d83b709f96502a3

BUILD

diff --git a/BUILD b/BUILD
index 1379fbc..d490714 100644
--- a/BUILD
+++ b/BUILD
@@ -1,3 +1,4 @@
+load("@rules_java//java:defs.bzl", "java_library")
 load("//tools/bzl:junit.bzl", "junit_tests")
 load(
     "//tools/bzl:plugin.bzl",