[Orgs] User settings - Add wallet flow

[usame-algan]

Links

Epic on Notion: https://www.notion.so/safe-global/Org-onboarding-flow-1208180fe57380078591f5380a0c5d2a

What must be done

• There is a button to link a new wallet
• The user has to switch to their new wallet first
• The user is prompted to sign a SiWE message
• After confirmation the wallet is displayed in the list

Designs/sketches

https://www.figma.com/design/PeChIDi5UKPjf58IOChtET/Organizations?node-id=3694-28974&m=dev

How to test it

• It should match the design