Support new send navigational flow

[aristidesstaffieri]

What problem does your feature solve?

Send flow should support new flow architecture

What would you like to see?

Send flow should have a new navigational flow.
Send Amount -> Set Destination OR Set Asset -> Review * Submit

What alternatives are there?

Use current flow

[Keeeeeeeks]

9/22 update:

• Sized as 2, Prio (Unprio'd -> P2). It's a UX improvement