Optimize verification of the request signatures

[cthulhu-rider]

will implement PoC for ObjectService.Put as the most signature verification-laden RPCs

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (c1b8cac) 28.49% compared to head (5b87eed) 28.46%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2685 +/- ## ========================================== - Coverage 28.49% 28.46% -0.04% ========================================== Files 413 417 +4 Lines 31966 32058 +92 ========================================== + Hits 9108 9124 +16 - Misses 22078 22150 +72 - Partials 780 784 +4 ```

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[roman-khimov]

Still relevant?