Add WC signing request flow

[clauxx]

Feature Issue

User Story

As a user, I want to be able to sign requests from Wallet Connect, so that I can perform actions in other dApps using the keys from my wallet.

Description

The app should react to incoming Wallet Connect requests and show a screen that prompts the user to confirm the request. Design fidelity is not important here, so the focus is mostly on UX.

Design link

Acceptance Criteria

• The user can see a new signing request when prompted from a dApp
• The user can see the contents of the request
• The user can accept the request
• The user should authenticate with the device (password/biometric) when accepting
• The user should be able to sign data from the following RPC methods
  • eth_sign
  • personal_sign
  • eth_signTypedData
  • eth_signTypedData_v4