Add range bids for trait bidding

[shanev]

Allow placing a "range bid" for 2-25 tokens at once. This is like a collection bid but across a range of token ids. It can be used for a trait bidding feature.

pub struct Bid {
    pub collection: Addr,
    pub id: u64,
    pub token_id: Vec<TokenId>,
    pub bidder: Addr,
    pub price: Uint128,
    pub finders_fee_bps: Option<u64>,
    pub expires_at: Timestamp,
}

Key: (collection, id, bidder)

Would require an auto-incrementing id to index.