Update on Validator Quality of Service API

Please note that when there is 1 shardchain in the blockchain, the QoS API collects enough data to calculate the efficiency of validators with an index >= 100 within 6-8 hours after the start of the validation cycle. Until then, efficiency estimates may be inaccurate due to insufficient data.

With more shardchains, this time is reduced; for example, with 4 shardchains, the efficiency rating is ready after 1 hour.

For validators with an index < 100, the efficiency rating is ready after 30 minutes, regardless of the number of shardchains.