This now checks if frame or a local node is running and else uses infura
to connect to the ethereum network.
Now you can use all the helpers for the testnets/mainnet without running
anything (in readonly mode)
Ideally eth-provider checks which connection is available and uses the
available one.
frame => local node => infura
But it seems there is still a bug and it raises an error if frame is not
available.
But at least we can use frame now for testnet/mainnet deployments
