Add WalletsGate and ChainGate to app (#2086)

Much less messy UI by gating chain connection checks and wallet
connection checks.

If you want to refer to user addresses or chains, pass it into your
component as a prop. Example shown in the balances-overview component

- feat(app): add wallet-gate
- feat(app): add chains-gate
- refactor(app): simplify chains/wallet fetching
- chore(app): fmt and spelling fixes