[DISCUSS] Deprecate isOffline and isSplitParent in RegionInfo

[Yulin Niu]

Hi, guys:

We want to deprecate isOffline and isSplitParent in RegionInfo, let us use
isSplit instead. I'd like to start a discussion on this issue.
FYI HBASE-25210 <https://issues.apache.org/jira/browse/HBASE-25210>

Thanks