[DRAFT] simulators: Beacon API Simulator #784
                
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This is experimental, it's a proof of concept to run tests produced by [ethereum/consensus-specs](#784) that contains extra testing steps to validate the Beacon API using hive.
Hive parses a
hive.yamlfile with instructions of queries to perform on a given chain on the consensus client.Same could be done in theory for a Beacon P2P simulator.