-ethOrchAddr to be able to take an ENS name

[chrishobcroft]

Is your feature request related to a problem? Please describe.

Selecting an Orchestrator via a complex hexadecimal string is excessively complicated UX.

Describe the solution you'd like

As a Broadcaster, I want to be able to select an Orchestrator by specifying their ENS name.

For example, -ethOrchAddr livepool.eth should resolve to -ethOrchAddr 0xf4e8Ef0763BCB2B1aF693F5970a00050a6aC7E1B

Describe alternatives you've considered

None.

Additional context

None

[hthillman]

ENS support is coming soon in the explorer so IMO it makes sense to enable it system-wide. we may not have the engineering bandwidth to address this rapidly, so i've marked as help wanted