Add Hive power calculation

Add utilities to calculate Hive power for given account to vax.

@kmochocki added that link for me: https://gitlab.syncad.com/hive/clive/-/blob/b481c37f694790fc60acb75a0ac614f44c30bfc0/clive/__private/core/commands/update_node_data.py#L284

We want to be able to display all the stuff hiveblocks shows: https://hiveblocks.com/@ugochill