describeCollection returns collection createUtcTime (#1388)

Signed-off-by: yhmo <yihua.mo@zilliz.com>

sdk-core/src/main/java/io/milvus/v2/service/collection/response/DescribeCollectionResp.java

@@ -46,6 +46,7 @@ public class DescribeCollectionResp {
 
     private CreateCollectionReq.CollectionSchema collectionSchema;
     private Long createTime;
+    private Long createUtcTime;
     private ConsistencyLevel consistencyLevel;
     private Integer shardsNum;
     @Builder.Default

sdk-core/src/main/java/io/milvus/v2/utils/ConvertUtils.java

@@ -145,6 +145,7 @@ public class ConvertUtils {
                 .vectorFieldNames(response.getSchema().getFieldsList().stream().filter(fieldSchema -> ParamUtils.isVectorDataType(fieldSchema.getDataType())).map(FieldSchema::getName).collect(java.util.stream.Collectors.toList()))
                 .primaryFieldName(response.getSchema().getFieldsList().stream().filter(FieldSchema::getIsPrimaryKey).map(FieldSchema::getName).collect(java.util.stream.Collectors.toList()).get(0))
                 .createTime(response.getCreatedTimestamp())
+                .createUtcTime(response.getCreatedUtcTimestamp())
                 .consistencyLevel(io.milvus.v2.common.ConsistencyLevel.valueOf(response.getConsistencyLevel().name().toUpperCase()))
                 .shardsNum(response.getShardsNum())
                 .properties(properties)