protos: move the transaction fee out of the transaction body and into…

… the transaction parameters, add FeeView message type

proto/penumbra/penumbra/core/component/fee/v1alpha1/fee.proto

@@ -13,6 +13,23 @@ message Fee {
   asset.v1alpha1.AssetId asset_id = 2;
 }
 
+message FeeView {
+
+  message Visible {
+    // The fee paid by the transaction.
+    component.fee.v1alpha1.Fee fee = 1;
+    // The metadata of the asset used to pay fees.
+    asset.v1alpha1.DenomMetadata denom_metadata = 2;
+    }
+  message Opaque {
+    // The fee paid by the transaction.
+    component.fee.v1alpha1.Fee fee = 1;
+  }
+  oneof fee_view {
+    Visible visible = 1;
+    Opaque opaque = 2;
+  }
+}
 message GasPrices {
   // The price per unit block space in terms of the staking token, with an implicit 1,000 denominator.
   uint64 block_space_price = 1;

proto/penumbra/penumbra/core/transaction/v1alpha1/transaction.proto

@@ -35,12 +35,10 @@ message TransactionBody {
   repeated Action actions = 1;
   // Parameters determining if a transaction should be accepted by this chain.
   TransactionParameters transaction_parameters = 2;
-  // The transaction fee.
-  component.fee.v1alpha1.Fee fee = 3;
   // Detection data for use with Fuzzy Message Detection
-  DetectionData detection_data = 4;
+  DetectionData detection_data = 3;
   // Sub-message containing memo ciphertext if a memo was added to the transaction.
-  MemoData memo_data = 5;
+  MemoData memo_data = 4;
 }
 
 // Represents the encrypted memo data.
@@ -59,6 +57,8 @@ message TransactionParameters {
   // The chain this transaction is intended for.  Including this prevents
   // replaying a transaction on one chain onto a different chain.
   string chain_id = 2;
+  // The transaction fee.
+  component.fee.v1alpha1.Fee fee = 3;
 }
 
 // Detection data used by a detection server performing Fuzzy Message Detection.