blob: IO statistics added

It shows total numbers and sizes of reads/writes/lookups
it's logged in data.iostat in eblob working directory
stat: Time statistics monitoring added.
- React added
- Monitoring actions added
- Handle to get statistics added
stat: Bug with allocated string size fixed. Obsolete code removed.
Merge pull request #54 from IIoTeP9HuY/io_stats

IO statistics. Monitoring.