[e.cash] Add finalization indication on live transactions

Summary:
Use the ws TX_FINALIZED message to update the finalization state of the transactions
Update the UI based on finalization

Test Plan:
preview and make or look for a fresh transaction
Non-finalized should have a blue background and "Finalizing..." text
then they switch to a gray background with a checkmark once finalized

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Subscribers: Fabien, Mengerian

Differential Revision: https://reviews.bitcoinabc.org/D19377