[native] Add wallet identifier tile to ExistingEthereumAccount

Summary:
See designs here (for ENS name) and here (for wallet address).

To make it easier to access the wallet address, I also added that to ExistingEthereumAccountParams.

Depends on D7882

Test Plan:

ENS name	Wallet address

Reviewers: atul, ginsu

Reviewed By: atul

Subscribers: tomek

Differential Revision: https://phab.comm.dev/D7886