Move RDAP Terms of Service into YAML config file

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=214642487

java/google/registry/config/RegistryConfigSettings.java

@@ -90,6 +90,7 @@ public class RegistryConfigSettings {
     public String premiumTermsExportDisclaimer;
     public String reservedTermsExportDisclaimer;
     public String whoisDisclaimer;
+    public String rdapTos;
   }
 
   /** Configuration for Cloud Datastore. */