Add timestamp for skale-stats API

[oleksandrSydorenkoJ]

In the current implementation, the Skale-stats API call returns statistics, but it is unclear over what time period this data was collected. For more detailed and convenient use of this API, adding a timestamp with second-level precision is necessary.
This could be either the time when the signal is received or the time when Skaled itself collects the statistics.

Example Request and response

 curl -X POST --data '{"jsonrpc":"2.0","method":"skale_stats","params":null,"id":1205}' http://1.1.1.1:10000 
{"id":1205,"jsonrpc":"2.0","result":{"blocks":{"blocksPerSecond":0.08748149665151735,"pendingTxPerSecond":0.0,"transactionsPerBlock":0.0,"transactionsPerSecond":0.0},"executionPerformance":{"RPC":{"protocols":{"HTTP":{"callTimeAvg":0.0002866372699999999,"callTimeMax":0.000442635,"callTimeMin":4.0637e-05,"methodMax":"eth_getBlockByNumber","methodMin":"eth_blockNumber"},"WS":{"callTimeAvg":0.00039311090000000004,"callTimeMax":0.003391724,"callTimeMin":2.9296e-05,"methodMax":"eth_subscribe","methodMin":"eth_subscribe"}},"summary":{"callTimeAvg":0.00029631669090909087,"callTimeMax":0.000442635,"callTimeMin":2.9296e-05,"methodMax":"eth_getBlockByNumber","methodMin":"eth_subscribe","protocolMax":"HTTP","protocolMin":"WS"}}},"protocols":{"http":{"listenerCount":2,"rpc":{"eth_blockNumber":{"answers":58917,"aps":0.1280921614956834,"bps_recv":8.500761888629956,"bps_sent":6.288230191859161,"bytes_recv":4300932,"bytes_sent":3181509,"calls":58917,"cps":0.1280921614956834,"erps":0.0,"errors":0,"exceptions":0,"exps":0.0},"eth_call":{"answers":12091,"aps":0.026285855656217882,"bps_recv":9.239777091548742,"bps_sent":2.71416401982978,"bytes_recv":4674820,"bytes_sent":1373218,"calls":12091,"cps":0.026285855604263914,"erps":0.0,"errors":0,"exceptions":0,"exps":0.0},"eth_chainId":{"answers":14367,"aps":0.03123420870437437,"bps_recv":1.998730040491633,"bps_sent":1.6295774603207325,"bytes_recv":1011248,"bytes_sent":824477,"calls":14367,"cps":0.03123420870437437,"erps":0.0,"errors":0,"exceptions":0,"exps":0.0},"eth_getBalance":{"answers":39500,"aps":0.08587659366417986,"bps_recv":9.91504846167949,"bps_sent":8.741424147674497,"bytes_recv":5016500,"bytes_sent":4422707,"calls":39500,"cps":0.08587659366417986,"erps":0.0,"errors":0,"exceptions":0,"exps":0.0},"eth_getBlockByNumber":{"answers":3200128,"aps":6.957378887485765,"bps_recv":582.0568099627303,"bps_sent":10543.590546190428,"bytes_recv":294496165,"bytes_sent":5334611550,"calls":3200128,"cps":6.957378887485765,"erps":0.0,"errors":0,"exceptions":0,"exps":0.0},"eth_getCode":{"answers":4,"aps":8.117786785444081e-06,"bps_recv":0.0011202545763912832,"bps_sent":0.020440587125748196,"bytes_recv":483,"bytes_sent":8813,"calls":4,"cps":8.117786785444081e-06,"erps":0.0,"errors":0,"exceptions":0,"exps":0.0},"eth_getStorageAt":{"answers":93,"aps":0.00023526529348594786,"bps_recv":0.04227118719941306,"bps_sent":0.02414601488469684,"bytes_recv":18219,"bytes_sent":10407,"calls":93,"cps":0.00023526529348594786,"erps":0.0,"errors":0,"exceptions":0,"exps":0.0},"eth_getTransactionReceipt":{"answers":4,"aps":8.117760482628786e-06,"bps_recv":0.0013800192788461319,"bps_sent":0.01198877255277377,"bytes_recv":595,"bytes_sent":5169,"calls":4,"cps":8.117760463800775e-06,"erps":0.0,"errors":0,"exceptions":0,"exps":0.0},"skale_imaInfo":{"answers":6739,"aps":0.014649825702453509,"bps_recv":1.4285240292530297,"bps_sent":11.73293116333495,"bytes_recv":722754,"bytes_sent":5936213,"calls":6739,"cps":0.014649825673498113,"erps":0.0,"errors":0,"exceptions":0,"exps":0.0},"skale_nodesRpcInfo":{"answers":565,"aps":0.0012266161133747794,"bps_recv":0.12604537942784055,"bps_sent":4.1909159870265995,"bytes_recv":63772,"bytes_sent":2120372,"calls":565,"cps":0.0012266161085259652,"erps":0.0,"errors":0,"exceptions":0,"exps":0.0},"skale_stats":{"answers":0,"aps":0.0,"bps_recv":null,"bps_sent":0.0,"bytes_recv":65,"bytes_sent":0,"calls":1,"cps":null,"erps":0.0,"errors":0,"exceptions":0,"exps":0.0}},"stats":{"":{"answers":0,"aps":0.0,"bps_recv":5.336407029995254e-05,"bps_sent":0.0,"bytes_recv":27,"bytes_sent":0,"calls":2,"cps":2.5693811625903074e-06,"erps":0.0,"errors":0,"exceptions":0,"exps":0.0},"POST":{"answers":3332408,"aps":7.244968107209755,"bps_recv":613.3034454897362,"bps_sent":10578.935326122051,"bytes_recv":310305643,"bytes_sent":5352494516,"calls":3332409,"cps":7.24497028130425,"erps":0.0,"errors":0,"exceptions":0,"exps":0.0}}},"https":{"listenerCount":1,"rpc":{},"stats":{"":{"answers":0,"aps":0.0,"bps_recv":1.7788023433317515e-05,"bps_sent":0.0,"bytes_recv":9,"bytes_sent":0,"calls":1,"cps":3.952894096292781e-07,"erps":0.0,"errors":0,"exceptions":0,"exps":0.0}}},"ws":{"listenerCount":1,"rpc":{"eth_subscribe":{"answers":10,"aps":2.0004706810412885e-05,"bps_recv":0.0017588296680838258,"bps_sent":0.001263663657925091,"bytes_recv":888,"bytes_sent":638,"calls":10,"cps":2.0004706810412885e-05,"erps":0.0,"errors":0,"exceptions":0,"exps":0.0},"eth_subscription/newHeads":{"answers":38743,"aps":0.08440953389526944,"bps_recv":0.0,"bps_sent":130.53114295738686,"bytes_recv":0,"bytes_sent":65902122,"calls":0,"cps":0.0,"erps":0.0,"errors":0,"exceptions":0,"exps":0.0}},"stats":{"messages":{"answers":10,"aps":2.0004706850035487e-05,"bps_recv":0.0017588296680838258,"bps_sent":0.0012636636604279844,"bytes_recv":888,"bytes_sent":638,"calls":10,"cps":2.0004706810412885e-05,"erps":0.0,"errors":0,"exceptions":0,"exps":0.0}}},"wss":{"listenerCount":1,"rpc":{},"stats":{}}},"rpc":{"eth_blockNumber":{"answers":58917,"aps":0.1280921614956834,"bp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