Merge branch '8.1.x' into master by akhileshm1

Author: semaphore-agent-production[bot]

core/src/main/java/io/confluent/kafka/schemaregistry/storage/SchemaRegistry.java

@@ -106,6 +106,8 @@ default Set<String> listSubjects() throws SchemaRegistryException {
   Set<String> listSubjects(LookupFilter filter)
           throws SchemaRegistryException;
 
+  Set<String> listSubjectsForId(int id, String subject) throws SchemaRegistryException;
+
   Set<String> listSubjectsForId(int id, String subject, boolean returnDeleted)
       throws SchemaRegistryException;
 
@@ -267,6 +269,8 @@ void deleteSubjectMode(String subject) throws SchemaRegistryStoreException,
 
   SslFactory getSslFactory();
 
+  LookupCache<SchemaRegistryKey, SchemaRegistryValue> getLookupCache();
+
   default void clearOldSchemaCache() {}
 
   default void clearNewSchemaCache() {}