Wallet portfolio

[michele-franchi]

Please describe the problem that your request should resolve.

Describe the solution you'd like

• Add total value in the wallet and total tokens as blocks
• Add table with assets list
• resolve 2 minor UX improvements from previous implementation feat: Wallet account view #549 (comment)

Is it already possible to achieve the same outcome in any other way? If so, how?

Additional context

[janmichek]

This will need a new endpoint.
Requested here aeternity/ae_mdw#1624

Also some refinement of the design would be nice, as we didn't make solid conclusion of what should be displayed there.