Add extensible custom logic to the domain check flow

This also fixes up a hook on the domain create flow custom logic to use a single
parameter, which is the general pattern we want to use going forward. It also
establishes a pattern for custom logic being able to add extensions.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=139362230

java/google/registry/flows/custom/CustomLogicModule.java

@@ -28,4 +28,10 @@ public class CustomLogicModule {
       CustomLogicFactory factory, EppInput eppInput, SessionMetadata sessionMetadata) {
     return factory.forDomainCreateFlow(eppInput, sessionMetadata);
   }
+
+  @Provides
+  static DomainCheckFlowCustomLogic provideDomainCheckFlowCustomLogic(
+      CustomLogicFactory factory, EppInput eppInput, SessionMetadata sessionMetadata) {
+    return factory.forDomainCheckFlow(eppInput, sessionMetadata);
+  }
 }