Tally query

[JakeHartnell]

As a DAO member, I would like to know how close a vote is to passing.

Currently, from the queries included in the cw3 spec, it's a pain to figure this out (especially if there are a large number of voters).

So let's introduce a Tally { proposal_id: u64 } query, which will return info about the current vote tally. Imagine it would look something like this:

#[derive(Serialize, Deserialize, Clone, PartialEq, JsonSchema, Debug)]
pub struct VoteTallyResponse {
    // Current proposal status
    pub status: Status,
    // Required passing criteria
    pub threshold: ThresholdResponse,
    // Percentage of turnout
    pub quorum: Decimal,
    // Total number of votes
    pub total_votes: Uint128,
    // absolute number of votes
    pub total_weight: Uint128,
    // Tally's of the different votes
    pub votes: Votes,
}

We should be able to extend the existing proposal implementation in both cw3-dao and cw3-flex-multisig for this.