Support ability to Add a wallet to an email account (UI)

[ratik21]

What does this do?

Adds UI for supporting "Add Wallet", if a user has signed in via an email account. This is currently feature flagged under enableAddWallets key.

• User can click on + Add Wallet button to link a new wallet
• If metamask is already connected, then just directly show the Modal (sc)
• otherwise, user is prompted to connect their wallet first, and then the modal is shown
• this also fixes some of the global state management using rainbowKit/connect. we weren't storing the walletAddress, and the connectedId correctly in our redux state before.

(Add wallets button)

(if wallet is already connected)

(if not, connect wallet first)

Follow ups

• Saga logic
• backend integration