feat: adding msgburnv1 for backwards compatibility

as we transition to v2 we'll need to have access to both v1 and v2 types
for burn and control by feature flags which version to use

proto/florin/v1/tx.proto

@@ -90,6 +90,26 @@ message MsgAllowDenom {
 // MsgAllowDenomResponse is the response of the AllowDenom action.
 message MsgAllowDenomResponse {}
 
+// MsgBurnV1 implements the burn (0x8d1247ba) method.
+message MsgBurnV1 {
+  option (cosmos.msg.v1.signer) = "signer";
+  option (amino.name) = "florin/Burn";
+
+  option (gogoproto.equal) = false;
+  option (gogoproto.goproto_getters) = false;
+
+  string denom = 1;
+  string signer = 2 [(cosmos_proto.scalar) = "cosmos.AddressString"];
+  string from = 3 [(cosmos_proto.scalar) = "cosmos.AddressString"];
+  string amount = 4 [
+    (amino.dont_omitempty) = true,
+    (cosmos_proto.scalar) = "cosmos.Int",
+    (gogoproto.customtype) = "cosmossdk.io/math.Int",
+    (gogoproto.nullable) = false
+  ];
+  bytes signature = 5;
+}
+
 // MsgBurn implements the burn (0x8d1247ba) method.
 message MsgBurn {
   option (cosmos.msg.v1.signer) = "signer";