[BESU-1919] Add proper support for eth_hashrate

[matkt]

PR description

• Implemented submitHashrate endpoint which is by default limited to 1000 sealers. Adding a 1001 will remove the oldest from the list (0x0 hashrate is refused)
• Updated eth_hashrateendpoint so that it returns the cumulative hashrate of all sealers if the list is not empty. Otherwise it returns the local hashrate
• Added hashrate submission with Stratum1EthProxyProtocol and Stratum1Protocol
• Added CLI Option to modify the number of sealers limit

Tested

• Tested the hashrate submission with stratum
• Tested the hashrate submission with json rpc api

{"id":1,"jsonrpc":"2.0","method":"eth_submitHashrate","params":["0x00","0x01"]}

{"id":1,"jsonrpc":"2.0","method":"eth_submitHashrate","params":["0x01","0x01"]}

• Tested with CPU and GPU mining
• Tested submission TTL

[shemnon]

I think we need to move the hashrate logic out of the AbstractMiningCoordinator into EthashMiningCoordinator and not expose the SealerInfo map and instead expose the aggregate hashrate.

[shemnon]

I think it would be better to move all the logic around submitting hashrate and storing the sealerInfo down into the EthashMiningCoordinator. IBFT and Clique will never use these.

[matkt]

Done

[MadelineMurray]

Raised hyperledger/besu-docs#414 to doc this so this can be closed.