Implement input for MRs over child entities

Also throwing in a proof-of-concept MR that I'd like to run in production, and then scrap once the meaty MR is finished (e.g. exploding Recurring billing events into OneTimes).
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=119881471

java/com/google/domain/registry/module/tools/BUILD

@@ -19,6 +19,7 @@ java_library(
         "//java/com/google/domain/registry/request",
         "//java/com/google/domain/registry/request:modules",
         "//java/com/google/domain/registry/tools/server",
+        "//java/com/google/domain/registry/tools/server/javascrap",
         "//java/com/google/domain/registry/util",
         "//third_party/java/bouncycastle",
         "//third_party/java/dagger",

java/com/google/domain/registry/module/tools/ToolsRequestComponent.java

@@ -37,6 +37,7 @@ import com.google.domain.registry.tools.server.ResaveAllEppResourcesAction;
 import com.google.domain.registry.tools.server.ToolsServerModule;
 import com.google.domain.registry.tools.server.UpdatePremiumListAction;
 import com.google.domain.registry.tools.server.VerifyOteAction;
+import com.google.domain.registry.tools.server.javascrap.CountRecurringBillingEventsAction;
 
 import dagger.Subcomponent;
 
@@ -50,6 +51,7 @@ import dagger.Subcomponent;
         ToolsServerModule.class,
     })
 interface ToolsRequestComponent {
+  CountRecurringBillingEventsAction countRecurringBillingEventsAction();
   CreateGroupsAction createGroupsAction();
   CreatePremiumListAction createPremiumListAction();
   DeleteEntityAction deleteEntityAction();