add shardsNum for describeCollection (#1290)

Signed-off-by: Nian Liu <nian.liu@zilliz.com>
(cherry picked from commit 25d3cbde6c46c077808640464b4e4e11538c6b5c)

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 ConsistencyLevel consistencyLevel;
+    private Integer shardsNum;
     @Builder.Default
     private final Map<String, String> properties = new HashMap<>();
 }

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

@@ -140,6 +140,7 @@ public class ConvertUtils {
                 .primaryFieldName(response.getSchema().getFieldsList().stream().filter(FieldSchema::getIsPrimaryKey).map(FieldSchema::getName).collect(java.util.stream.Collectors.toList()).get(0))
                 .createTime(response.getCreatedTimestamp())
                 .consistencyLevel(io.milvus.v2.common.ConsistencyLevel.valueOf(response.getConsistencyLevel().name().toUpperCase()))
+                .shardsNum(response.getShardsNum())
                 .properties(properties)
                 .build();
         return describeCollectionResp;