Avoid use of checking and casting to LLRealtimeSegmentDataManager in SegmentOfflineStateModelFactory

As example take a look at this code in SegmentOnlineOfflineStateModelFactory.java::onBecomeOnlineFromConsuming()
```

try {
if (!(acquiredSegment instanceof LLRealtimeSegmentDataManager)) {
// We found an LLC segment that is not consuming right now, must be that we already swapped it with a
// segment that has been built. Nothing to do for this state transition.
_logger
.info("Segment {} not an instance of LLRealtimeSegmentDataManager. Reporting success for the transition",
acquiredSegment.getSegmentName());
return;
}
LLRealtimeSegmentDataManager segmentDataManager = (LLRealtimeSegmentDataManager) acquiredSegment;
SegmentZKMetadata segmentZKMetadata = ZKMetadataProvider
.getSegmentZKMetadata(_instanceDataManager.getPropertyStore(), realtimeTableName, segmentNameStr);
segmentDataManager.goOnlineFromConsuming(segmentZKMetadata);
} catch (InterruptedException e) {
String errorMessage = String.format("State transition interrupted for segment %s.", segmentNameStr);
_logger.warn(errorMessage, e);
tableDataManager
.addSegmentError(segmentNameStr, new SegmentErrorInfo(System.currentTimeMillis(), errorMessage, e));
throw new RuntimeException(e);
} finally {
tableDataManager.releaseSegment(acquiredSegment);
}
```
The details of realtime segment data manger should be handled in that class on a method called when this transitions for all types of segment data managers. Default NOP implementation can be used for other types of segement data managers

Start with SegmentOnlineOfflineStateModelFactory.java::onBecomeOnlineFromConsuming(), then compare the corresponding transition in SegmentOfflineStateModelFactory. Trace how segment data managers handle this transition; done when the factory no longer checks or casts to LLRealtimeSegmentDataManager and other manager types have a default no-op path.

Written by the indexing model from the issue text.