Blob files are included in SstFileManager DB size calculation #5127
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Blob files were not counted in DB size by SstFileManager. As a result, blob files are always subject to background file deletion rate limiting in DeleteScheduler. Normal SST files bypass the rate limiter if trash/db size ratio is above a certain threshold, which limits disk utilization due to accumulated trash.
This PR fixes it by adding Blob files size to the total DB size in SstFileManagerImpl::GetTotalSize(). Since blob file size increases on every blob write, we provide SstFileManagerImpl with a pointer to the blob file size atomic counter that it can look at in GetTotalSize(), otherwise it would be too much overhead to update SstFileManagerImpl on every blob write.
Test:
Add a new test in blob_db_test
make check