LidoOracleNew, ValidatorExitBus: initial rough version of hash consensus

[arwer13]

Initial untidy version of hash consensus, with further data report in single tx. Its purpose is to provide tooling with capability to test agains "two-phaseness".

It will be reimplemented/updated by further solid PR.

NB: gas consumption of reporting keys to eject (call to ValidatorExitBus.handleReportData) is:

1: 121465 per key (121465 total)
3: 33941.666666666664 per key (101825 total)
10: 16263.9 per key (162639 total)
40: 10604.475 per key (424179 total)
100: 9519.35 per key (951935 total)

(see test "Calculate gas usages")

[TheDZhon]

🚀 Blazingly fast

Though, have some questions 👀 :

[arwer13]

Current gas consumption of ValidatorExitBus.handleReportData:

1: 102572 per key (102572 total)
10: 13908.9 per key (139089 total)
100: 9133.84 per key (913384 total)
500: 9046.998 per key (4523499 total)

and without emit ConsensusDataDelivered(…):

1: 97440 per key (97440 total)
10: 11227.8 per key (112278 total)
100: 6703.09 per key (670309 total)
500: 6457.42 per key (3228710 total)

[folkyatina]

Looks fine for our needs.
There is some places that can be rewritten for clarity , but it is not worth it since we'll rewrite it anyway.

[TheDZhon]

It's good enough for testnets 👍