Store generated wallet_address and associate with user id in DB.

This is necessary to prevent the generated wallet address from being used by multiple users on the same device.

[ ] Add user_wallets table to associate user_id and wallet_address with additional metadata.
[ ] Add unique constraint to prevent a generated wallet from being associated with more than 1 user account.
[x] Send wallet address to server before connecting in order to associate the wallet with the user.

cwdevteam / mesa