Consolidate expand billing events action into 'batch' package

Now it lives alongside the delete prober data action, as well as any future
batch/maintenance tasks that should run periodically.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=134435668

java/google/registry/batch/BUILD

@@ -0,0 +1,37 @@
+package(
+    default_visibility = ["//java/google/registry:registry_project"],
+)
+
+licenses(["notice"])  # Apache 2.0
+
+
+java_library(
+    name = "batch",
+    srcs = glob(["*.java"]),
+    deps = [
+        "//java/com/google/common/annotations",
+        "//java/com/google/common/base",
+        "//java/com/google/common/collect",
+        "//java/com/google/common/html",
+        "//java/com/google/common/io",
+        "//java/com/google/common/net",
+        "//third_party/java/appengine:appengine-api",
+        "//third_party/java/appengine_gcs_client",
+        "//third_party/java/appengine_mapreduce2:appengine_mapreduce",
+        "//third_party/java/dagger",
+        "//third_party/java/joda_money",
+        "//third_party/java/joda_time",
+        "//third_party/java/json_simple",
+        "//third_party/java/jsr305_annotations",
+        "//third_party/java/jsr330_inject",
+        "//third_party/java/objectify:objectify-v4_1",
+        "//third_party/java/servlet/servlet_api",
+        "//java/google/registry/config",
+        "//java/google/registry/mapreduce",
+        "//java/google/registry/mapreduce/inputs",
+        "//java/google/registry/model",
+        "//java/google/registry/pricing",
+        "//java/google/registry/request",
+        "//java/google/registry/util",
+    ],
+)