Fix Hadoop federation to initialize the configuration prior to catalog initialization (#2282)

This PR addresses the gap in Hadoop federation to ensure that we initialize the hadoop configuration prior to initializing the catalog object.

The iceberg library expects the hadoop configuration to be initialized before creating a HadoopCatalog object. This change ensures that Polaris is compatible with the underlying iceberg library. Additionally, since the config initialization is based on the underlying (default) core-site.xml file, the change ensures that the federated catalog was created using `IMPLICIT` authentication mode. 

Testing: 
Due to current limitations in the current test setup, tested the change manually.
[TODO] Add a regtest with hadoop federation once the change is baked into the apache/polaris docker image.

Author: poojanilangekar

runtime/service/src/main/java/org/apache/polaris/service/catalog/iceberg/IcebergCatalogHandler.java

@@ -33,6 +33,7 @@
 import java.util.Optional;
 import java.util.Set;
 import java.util.stream.Collectors;
+import org.apache.hadoop.conf.Configuration;
 import org.apache.iceberg.BaseMetadataTable;
 import org.apache.iceberg.BaseTable;
 import org.apache.iceberg.MetadataUpdate;
@@ -76,6 +77,8 @@
 import org.apache.polaris.core.auth.PolarisAuthorizableOperation;
 import org.apache.polaris.core.auth.PolarisAuthorizer;
 import org.apache.polaris.core.config.FeatureConfiguration;
+import org.apache.polaris.core.connection.AuthenticationParametersDpo;
+import org.apache.polaris.core.connection.AuthenticationType;
 import org.apache.polaris.core.connection.ConnectionConfigInfoDpo;
 import org.apache.polaris.core.connection.ConnectionType;
 import org.apache.polaris.core.connection.hadoop.HadoopConnectionConfigInfoDpo;
@@ -232,9 +235,22 @@ protected void initializeCatalog() {
               connectionConfigInfoDpo.asIcebergCatalogProperties(getUserSecretsManager()));
           break;
         case HADOOP:
-          federatedCatalog = new HadoopCatalog();
+          // Currently, Polaris supports Hadoop federation only via IMPLICIT authentication.
+          // Hence, prior to initializing the configuration, ensure that the catalog uses
+          // IMPLICIT authentication.
+          AuthenticationParametersDpo authenticationParametersDpo =
+              connectionConfigInfoDpo.getAuthenticationParameters();
+          if (authenticationParametersDpo.getAuthenticationTypeCode()
+              != AuthenticationType.IMPLICIT.getCode()) {
+            throw new IllegalStateException(
+                "Hadoop federation only supports IMPLICIT authentication.");
+          }
+          Configuration conf = new Configuration();
+          String warehouse =
+              ((HadoopConnectionConfigInfoDpo) connectionConfigInfoDpo).getWarehouse();
+          federatedCatalog = new HadoopCatalog(conf, warehouse);
           federatedCatalog.initialize(
-              ((HadoopConnectionConfigInfoDpo) connectionConfigInfoDpo).getWarehouse(),
+              warehouse,
               connectionConfigInfoDpo.asIcebergCatalogProperties(getUserSecretsManager()));
           break;
         default: