Related to #35020 Signed-off-by: Congqi Xia <congqi.xia@zilliz.com>
issue: #33285 - move streaming related proto into pkg. - add v2 message type and change flush message into v2 message. Signed-off-by: chyezh <chyezh@outlook.com>
issue: #33285 - add streaming coord channel assignment watch client Signed-off-by: chyezh <chyezh@outlook.com>