Support custom effective date for fee check command

Added support to specify custom effective date to run the fee check command.
Such functionality is useful for TLDs with creation price as a function of
time, such as those with EAP. However the implementation is not limited EAP or
create price check. Any fee check can specify a date, as long as its XML schema
supports a date.

Currently conforming to fee extension v12, subject to schema changes.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=133420255

java/google/registry/flows/domain/DomainCheckFlow.java

@@ -169,7 +169,9 @@ public class DomainCheckFlow extends BaseDomainCheckFlow {
             domainNames.get(domainName),
             getClientId(),
             feeCheck.getCurrency(),
-            now,
+            feeCheckItem.getEffectiveDate().isPresent()
+                ? feeCheckItem.getEffectiveDate().get()
+                : now,
             eppInput);
         feeCheckResponseItemsBuilder
             .add(builder.setDomainNameIfSupported(domainName).build());

java/google/registry/flows/domain/DomainInfoFlow.java

@@ -101,7 +101,7 @@ public class DomainInfoFlow extends BaseDomainInfoFlow<DomainResource, Builder>
           InternetDomainName.from(getTargetId()),
           getClientId(),
           null,
-          now,
+          feeInfo.getEffectiveDate().isPresent() ? feeInfo.getEffectiveDate().get() : now,
           eppInput);
       extensions.add(builder.build());
     }