refact: unify the update of table/stream

Sometimes we use UpdateTableMetaReq to update a stream, and other times we use UpdateTableMetaReq.update_stream_meta. But both SchemaApi::update_table_meta() and update_table_meta() handle stream and table with subtle differences. Although the current implementation is logically correct, we could consider refactoring in the future to express the requests for updating a stream and updating a table with a more clear structure, to avoid potential bugs.

Originally posted by @SkyFan2002 in https://github.com/datafuselabs/databend/pull/15582#discussion_r1606390653