Allow usage of allocation tokens in nomulus create_domain (#1756)

Useful when doing internal registrations like get.boo

core/src/test/java/google/registry/tools/CreateDomainCommandTest.java

@@ -179,6 +179,19 @@ class CreateDomainCommandTest extends EppToolCommandTestCase<CreateDomainCommand
     eppVerifier.verifySent("domain_create_metadata.xml");
   }
 
+  @Test
+  void testSuccess_allocationToken() throws Exception {
+    createTld("tld");
+    runCommandForced(
+        "--client=NewRegistrar",
+        "--registrant=crr-admin",
+        "--admins=crr-admin",
+        "--techs=crr-tech",
+        "--allocation_token=abc123",
+        "example.tld");
+    eppVerifier.verifySent("domain_create_token.xml");
+  }
+
   @Test
   void testFailure_duplicateDomains() {
     IllegalArgumentException thrown =

core/src/test/resources/google/registry/tools/server/domain_create_token.xml

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
+  <command>
+    <create>
+      <domain:create
+          xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
+        <domain:name>example.tld</domain:name>
+        <domain:period unit="y">1</domain:period>
+        <domain:registrant>crr-admin</domain:registrant>
+        <domain:contact type="admin">crr-admin</domain:contact>
+        <domain:contact type="tech">crr-tech</domain:contact>
+        <domain:authInfo>
+          <domain:pw>abcdefghijklmnop</domain:pw>
+        </domain:authInfo>
+      </domain:create>
+    </create>
+    <extension>
+      <allocationToken:allocationToken
+          xmlns:allocationToken=
+              "urn:ietf:params:xml:ns:allocationToken-1.0">
+        abc123
+      </allocationToken:allocationToken>
+    </extension>
+    <clTRID>RegistryTool</clTRID>
+  </command>
+</epp>