JB721InitTiersConfig
Config to initialize a JB721TiersHook with tiers and price data.
The tiers must be sorted by price (from least to greatest).
Notes:
- 
member: tiers The tiers to initialize the hook with.
 - 
member: currency The currency that the tier prices are denoted in. See
JBPrices. - 
member: decimals The number of decimals in the fixed point tier prices.
 - 
member: prices A contract that exposes price feeds that can be used to calculate prices in different currencies. To only accept payments in
currency, setpricesto the zero address. SeeJBPrices. 
struct JB721InitTiersConfig {
    JB721TierConfig[] tiers;
    uint32 currency;
    uint8 decimals;
    IJBPrices prices;
}