✨ Publish validator vote data

[Thomasvdam]

✨ Feature

Publish messages on the SQS queue that contain data about the validator votes for a block.

Motivation

This allows us to show in the explorer which validators missed signing blocks. This can help delegators make informed decisions about where to delegate their tokens.

Implementation

All the data we need should be available in the ListenFinalizeBlock handler.

Caution

A block contains the commits (votes) for the previous block, not the block that's currently being processed. So one publish can/will contain updates for multiple heights.

• Create method in the base package for parsing block vote data.
• Refactor SQS publisher to support sending messages for different block heights. Moved to 🔧 Refactor SQS publisher include timestamp and different block heights #242
• Create JSON format to send over the wire to the indexer.
• Publish messages on the SQS queue.