Batch-fetch prices from a standard SEP-40 oracle.
Calls lastprice(asset) for each asset in a single invocation.
fn get_prices(
env: soroban_sdk::Env,
oracle: soroban_sdk::Address,
assets: soroban_sdk::Vec,
) -> soroban_sdk::Map> Batch-fetch prices from an oracle that requires requester authentication.
Calls lastprice(requester, asset) for each asset. The requester must
be a registered consumer of the oracle and authorizes via require_auth.
fn get_prices_authed(
env: soroban_sdk::Env,
oracle: soroban_sdk::Address,
requester: soroban_sdk::Address,
assets: soroban_sdk::Vec,
) -> soroban_sdk::Map>