Enable Failover ETHURL Address options

[RyanC92]

Is your feature request related to a problem? Please describe.
A few weeks ago when Infura went offline for a few hours many orchestrators instantly dropped sessions, while me on Alchemy this was good, for them it was not. If we could have a flag for ethUrlFailover or something similar, where people could put a geth lite node or alchemy it would allow them to fail over in the event of an outage and continue to operate until normal operation is restored.

Describe the solution you'd like
If we could have a flag for ethUrlFailover or something similar, where people could put a geth lite node or alchemy it would allow them to fail over in the event of an outage and continue to operate until normal operation is restored.

[chrishobcroft]

Duplicate of #1959

[hthillman]

closing as dupe, continue any conversation on #1959