Confirmation State for Hardware Wallet Signing

Description of the feature

Feature would entail:

• Similar to how there's a loading screen when connecting a wallet, the idea would be to add a loading spinner when someone confirms a transaction/signing in the Metamask popup - after the "Confirm" button is clicked
  • This would apply to signing of transactions, messages and typed data, therefore these components would have to contain the functionality:
    • SignatureRequestOriginal
    • SignatureRequest
    • and ConfirmTransactionBase
  • Therefore, it may be logical to implement the functionality upstream in ConfirmTransaction - confirm-transaction.component.js
• Loading spinner would persist until hardware wallet transaction is either confirmed or rejected
• Spinner would prevent cycling through the transaction queue until the spinner goes away (either via user rejection or approval)

Reasons for the feature:

• Facilitates MV3 Hardware wallet changes as we can persist the client until the transaction is finished
• There are some user stories that benefit from a loading screen:
  • E.g., immediately directs user's attention to confirm the transaction/signing on their device. A new hardware wallet user would intuitively think that the transaction is finished when they hit "Confirm", esp. if this user is used to using hard-disk wallets
  • E.g., there are some situations where the app may appear broken if there's a pending transaction to be signed on the wallet - especially relevant to Ledgers