Add "progress" indication about the status of sent transaction

[thesheepcat]

Currently, a spinner icon shows when the message is being packed into a transaction and the transaction has been broadcasted to the node.
Propose a way to track the three status of each sent transaction, to allow the user to understand that the transaction is in-progress; the possible status are:

• Creating transaction (from when user clicks the send button to when transaction is broadcasted to the node)
• Transaction waiting in mempool (from when transaction is broadcasted to when transaction is included in a block)
• Transaction sent (when the backend collect the transaction).

We could query Kaspa node to get data of transaction when in mempool; if we get the data, it means transaction is in mempool.