feat: Add support for hathor-wallet-service

[msbrogli]

The hathor-wallet-service is a service designed to scale horizontally as the user base grows. It also speeds up loading wallets with dozens of thousands of transactions. Check out its design here.

General Notes

If the wallet has not been created yet or the service returned wallet-not-found, then we need to create a new wallet from the xpubkey. The creation of a new wallet is the only step that can take a while, so we need a new screen to let the user know what is happening under the hoods.

If the wallet is found, it will start almost immediately, loading the latest transactions and the balance.

To Do List

• [ ] Screen: Creating wallet
• [ ] History: Load more transactions when user paginates

Test List

• [ ] Authority tokens
• [ ] Load wallet with dozens of thousands of transactions