[web] Introduce basic ConnectedWalletInfo component

Summary: This component will replace the the Rainbowkit ConnectButton. For now just displays the ENS name or address of connected wallet. In future diffs will also display avatar (ENS or rainbowkit emoji) and will display AccountModal when clicked.

Test Plan:
Looks as expected:

Should we shorten the address?

Yeah I'll address that in subsequent diff.

Why are we keeping the ConnectButton around?

It's been helpful when working on this stack to be able to have them side-by-side. Since all of this is hidden behind an isDev check it just makes it more convenient instead of stashing/popping over and over again.

Reviewers: ashoat, tomek

Reviewed By: ashoat

Differential Revision: https://phab.comm.dev/D6570