CLEANUP: add fee support

Hooks up the plumping for fees in Galileo, but doesn't consume any of
the neat CLI args: it's just hardcoding low fees.

src/sender.rs

@@ -12,6 +12,7 @@ use penumbra_proto::view::v1::broadcast_transaction_response::Status as Broadcas
 use penumbra_asset::Value;
 use penumbra_custody::{AuthorizeRequest, CustodyClient};
 use penumbra_fee::FeeTier;
+use penumbra_fee::GasPrices;
 use penumbra_keys::{Address, FullViewingKey};
 use penumbra_txhash::TransactionId;
 use penumbra_view::ViewClient;
@@ -74,7 +75,14 @@ where
 
             let mut planner = Planner::new(OsRng);
 
-            // Hardcode low fees to unbreak txs.
+            // Here we hardcode low fees. It'd be nice to override via CLI arg.
+            // Look up GasPrices, because merely calling `set_fee_tier` is not sufficient.
+            let gp: GasPrices = self2
+                .view
+                .gas_prices()
+                .await
+                .expect("failed to look up GasPrices");
+            planner.set_gas_prices(gp);
             planner.set_fee_tier(FeeTier::Low);
 
             for value in values {