Feature: Add voting/non-voting validator list to validatorsAtHeight API

[ghost]

Summary

Currently the validators at height list for a block shows all validators in the set at the height, but not who voted/didnt vote, even though the block detail shows a count of who voted vs validator set count. It would be nice to see which validators voted/not voted.

Problem Definition

Currently the validators at height list for a block shows all validators in the set at the height, but not who voted/didnt vote, even though the block detail shows a count of who voted vs validator set count. It would be nice to see which validators voted/not voted.

Proposal

Option 1:

• Gather a list of the validators that voted
• Add the list to API api/v2/validators/height/{height} response

Option 2:

• Add whether the validator voted to the validator object returned from api/v2/validators/height/{height}
  • voted: Boolean

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For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate contributors tagged
• Contributor assigned/self-assigned