Include last voted BPs

[karynemayer]

Overview

We should add to obe-indexer voters table a last_voted column, get it by querying hyperion get_actions like this: hyperion.get(/v2/history/get_actions?limit=1&account=${row.voter}&filter=eosio%3Avoteproducer)

This will enable telosnetwork/open-block-explorer#475 (comment) not to be dependent on Hyperion directly

Acceptance criteria

• Voters table should include last_voted column
• Querying it should return the list of BPs that were last voted by a specific account

Technical considerations

Tasks

[tomtomcrypto]

We already have a producers field in the voter table that holds all the BPs the voter selected last time he voted what is the difference ? And our incremental pooling will make sure it gets updated as we go after the initial full load.

[tomtomcrypto]

Hmm yeah so what is missing would be the API route for it I think, so the frontend can get the current vote of a specific voter, gonna implement one shouldn't be long at all.