Best hand returns all hands ranked

[Deedasmi]

Side pot logic requires I know not just the overall table winner, but the entire ranking of best hand to least best.

Desired api:

pub fn best_hands(hands: HashMap<i32, [cards; 7]>) -> Vec<Vec<(i32, [cards; 5]>

i32 is the account ID and tells me who the winner is, cards is obv the cards that won. Outer vec should be ordered be best ([0]) to worst([len-1]). Ties should be flattened to the inner vec, order doesn't matter.