Prover: add `verify_log_entry_in_bound` api #896

Job	Run time
build all rust contracts	3m 29s
test eth-prover	3m 4s
test eth-client	5m 22s
test eth2-client	4m 52s
test eth2near/contract_wrapper	2m 45s
test eth2near/finality-update-verify	1m 7s
test eth2near/eth2-to-near-block-relay-rs	59s
test eth2near/eth2-contract-init	1m 6s
test eth2near/eth_rpc_client	1m 11s
	23m 55s

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