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Support backup cluster version and cluster ID
Describe your feature request related problem:
Backup cluster version and cluster ID into backupmeta.
https://github.com/pingcap/kvproto/blob/a57ca4f75a972ff522f3f7f0f903f9b074780df7/proto/backup.proto#L20-L21
They are useful for checking compatibility for different versions.
I think we should also add br
version into backup meta