avoid frequantly syncing stats simultaneously

## Enhancement

Now, ```StatsCacheImpl.Update``` can sync stats by version from the storage. we have many scenarios to call it. such as ```domain.loadStatsWorker``` and ```Analyze```. When customers use lightning, lightning will trigger the multi-analyzed tasks simultaneously. so it also triggers multi ```
StatsCacheImpl.Update``` simultaneously. it is unnecessary.

Trace StatsCacheImpl.Update and its callers, especially domain.loadStatsWorker and Analyze, to understand how simultaneous stats synchronization is triggered during Lightning multi-analyzed tasks. Determine the intended coordination behavior and verify that concurrent callers no longer cause unnecessary repeated version-based syncs from storage.

Written by the indexing model from the issue text.