Eth2 client: add trusted execution blocks submitter (#916) #868

Job	Run time
build all rust contracts	12m 41s
test eth-prover	7m 15s
test eth-client	10m 53s
test eth2-client	10m 33s
test eth2near/contract_wrapper	10m 6s
test eth2near/finality-update-verify	8m 1s
test eth2near/eth2-to-near-block-relay-rs	11m 6s
test eth2near/eth2-contract-init	9m 38s
test eth2near/eth_rpc_client	10m 23s
	1h 30m 36s

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