(Wallet) ☂️ Main umbrella issue for new onboarding flow

[simoarpe]

Description

Main umbrella issue to keep track of the new onboarding implementation for the Brave Wallet.

Figma design link: https://www.figma.com/file/oXIiv45pIhF2RGlpEjOfUg/Wallet-onboarding?node-id=6223%3A70942&mode=dev

⚠️ Note: the issue can be closed when all its related issues will be addressed.

• ✅ Tweak onboarding navigation controls - https://github.com/brave/brave-browser/issues/35488
• ✅ Initial onboarding screen and T&C screen - https://github.com/brave/brave-browser/issues/35713
• ✅ Connect backup wallet action from WebUI to native backup screen - https://github.com/brave/brave-browser/issues/35928
• ✅ Password creation screen - https://github.com/brave/brave-browser/issues/36552
• ✅ Wallet creation screen - https://github.com/brave/brave-browser/issues/36606
• ✅ Improve Wallet onboarding adapter - https://github.com/brave/brave-browser/issues/36678
• ✅ Unlock Wallet screen - https://github.com/brave/brave-browser/issues/37720
• ✅ Tweak layouts and styles following updated Figma design - https://github.com/brave/brave-browser/issues/38890
• ✅ Set up touch ID screen - https://github.com/brave/brave-browser/issues/38987
• Connect unlock action from WebUI to native unlock screen
• Recovery phrase flow
• 🔍Confirmation screen - https://github.com/brave/brave-browser/issues/39348

Out of Scope

✅ Network selection screen is currently out of scope.