- Defined hive.block_day_stats_view and hive.block_day_stats_all_ops_view...

- Defined hive.block_day_stats_view and hive.block_day_stats_all_ops_view providing a blockchain statistics on per-day basis. We could think about changing them to materialize views and implement periodical referesh for better performance
- hive_fork_manager depends on tablefunc postgres extension.