Refactor EntityCache to an interface

Author: andrew4699

polaris-core/src/main/java/org/apache/polaris/core/persistence/LocalPolarisMetaStoreManagerFactory.java

@@ -34,6 +34,7 @@
 import org.apache.polaris.core.entity.PolarisEntityType;
 import org.apache.polaris.core.persistence.bootstrap.RootCredentialsSet;
 import org.apache.polaris.core.persistence.cache.EntityCache;
+import org.apache.polaris.core.persistence.cache.InMemoryEntityCache;
 import org.apache.polaris.core.persistence.dao.entity.BaseResult;
 import org.apache.polaris.core.persistence.dao.entity.EntityResult;
 import org.apache.polaris.core.persistence.dao.entity.PrincipalSecretsResult;
@@ -190,7 +191,8 @@ public synchronized StorageCredentialCache getOrCreateStorageCredentialCache(
   public synchronized EntityCache getOrCreateEntityCache(RealmContext realmContext) {
     if (!entityCacheMap.containsKey(realmContext.getRealmIdentifier())) {
       PolarisMetaStoreManager metaStoreManager = getOrCreateMetaStoreManager(realmContext);
-      entityCacheMap.put(realmContext.getRealmIdentifier(), new EntityCache(metaStoreManager));
+      entityCacheMap.put(
+          realmContext.getRealmIdentifier(), new InMemoryEntityCache(metaStoreManager));
     }
 
     return entityCacheMap.get(realmContext.getRealmIdentifier());