chore!: wallet related signals alignment

A signal type `wallet` which had an event `type` set to `sing-transactions` is now a new signal
type `wallt.sing.transactions` with event which represents list of transactions that need to be signed.

services/wallet/transfer/transaction_manager_multitransaction.go

@@ -68,7 +68,7 @@ func (tm *TransactionManager) SendTransactionForSigningToKeycard(ctx context.Con
 		return err
 	}
 
-	signal.SendTransactionsForSigningEvent(hashes)
+	signal.SendWalletEvent(signal.SignTransactions, hashes)
 
 	return nil
 }

services/wallet/walletevent/transmitter.go

@@ -48,7 +48,7 @@ func (tmr *SignalsTransmitter) Start() error {
 				return
 			case event := <-events:
 				if !event.Type.IsInternal() {
-					signal.SendWalletEvent(event)
+					signal.SendWalletEvent(signal.Wallet, event)
 				}
 			}
 		}

signal/events_wallet.go

@@ -1,19 +1,13 @@
 package signal
 
+type SignalType string
+
 const (
-	walletEvent = "wallet"
+	Wallet           = SignalType("wallet")
+	SignTransactions = SignalType("wallet.sign.transactions")
 )
 
-type UnsignedTransactions struct {
-	Type         string   `json:"type"`
-	Transactions []string `json:"transactions"`
-}
-
 // SendWalletEvent sends event from services/wallet/events.
-func SendWalletEvent(event interface{}) {
-	send(walletEvent, event)
-}
-
-func SendTransactionsForSigningEvent(transactions []string) {
-	send(walletEvent, UnsignedTransactions{Type: "sing-transactions", Transactions: transactions})
+func SendWalletEvent(signalType SignalType, event interface{}) {
+	send(string(signalType), event)
 }