Marketplace V2 Expiring Orders

[tasiov]

Marketplace V2 Expiring Orders

This PR implements Expiring Orders on Stargaze Marketplace V2. The implemented features are outlined below.

Features

• Each order (Ask, Bid, Collection Bid) now has an optional details.expiry attribute.

pub struct OrderDetails<T: AddressLike> {
    pub price: Coin,
    pub recipient: Option<T>,
    pub finder: Option<T>,
    pub expiry: Option<Expiry>,
}

pub struct Expiry {
    pub timestamp: Timestamp,
    pub reward: Coin,
}

• When an Order is created or updated, the user may set a timestamp and supply funds that match the expiry.reward. This data signifies that whomever removes the Order after the timestamp has elapsed will be owed the expiry reward.

• There is an admin managed MIN_EXPIRY_REWARDS map that sets the minimum viable expiry reward for specified denoms.

• An index has been added on expiry.timestamp that allows traversing all Asks / Bids / Collection Bids by their expiration timestamp.

• A Sudo::EndBlock message has been added that traverses the Order expiration timestamps, removes some number of expired Orders, and sends the rewards to the fee_manager address. The number of Orders removed each block is capped at the corresponding Config values: max_asks_removed_per_block, max_bids_removed_per_block, max_collection_bids_removed_per_block.