ExecutionClient returns PromiseInterface #2856
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Resolves NIT-2566
As a preparation for running Consensus and Execution in different processes, in which they communicate through the network, this PR updates ExecutionClient interface functions to return promises.
Later, clients implementing EecutionClient will handle the network communication with Consensus side.
Instead of going over all functions from the different types of execution clients (ExecutionSequencer, ExecutionRecorder, etc), this PR only updates ExecutionClient.
Most alternative execution clients, besides the one that we already have based on geth, will only implement ExecutionClient instead of all execution clients.
So it seems reasonable to scope down and only introduce changes related to ExecutionClient for now.
This PR also introduces TestExecutionClientOnly, that guarantees that using a execution node that only implements functions related to ExecutionClient is enough to handle some scenarios.