enhance: add common.IDRange and per-file PK id range to ImportFile

Add a generic common.IDRange {begin, end} message and an optional
pk_id_range field on ImportFile. When set, an import materializes autoID
primary keys from the given per-file range instead of allocating them
locally, so the resulting primary keys are deterministic and known ahead
of the import; unset keeps the existing allocate-during-import behavior.

issue: #642
Signed-off-by: bigsheeper <yihao.dai@zilliz.com>

Author: bigsheeper