Support schemeshard login operation with precomputed hashes

[n00bcracker]

Changelog entry

Changelog category

• Not for changelog (changelog entry is not required)

Description for reviewers

It's part of PR series moving out hash computing from SchemeShard

[ydbot]

Run Extra Tests

Run additional tests for this PR. You can customize:

• Test Size: small, medium, large (default: all)
• Test Targets: any directory path (default: ydb/)
• Sanitizers: ASAN, MSAN, TSAN
• Coredumps: enable for debugging (default: off)
• Additional args: custom ya make arguments

[github-actions]

🟢 2026-01-02 16:50:39 UTC The validation of the Pull Request description is successful.

[github-actions]

⚪ 2026-01-07 15:31:35 UTC Pre-commit check linux-x86_64-relwithdebinfo for 3b9aec4 has started.
⚪ 2026-01-07 15:31:52 UTC Artifacts will be uploaded here
⚪ 2026-01-07 15:38:04 UTC ya make is running...
🟡 2026-01-07 17:59:30 UTC Some tests failed, follow the links below. Going to retry failed tests...

Details

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
45925	42714	0	5	3172	34

⚪ 2026-01-07 17:59:47 UTC ya make is running... (failed tests rerun, try 2)
🟢 2026-01-07 18:07:00 UTC Tests successful.

Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
671 (only retried tests)	658	0	0	0	13

🟢 2026-01-07 18:07:07 UTC Build successful.
🟡 2026-01-07 18:07:31 UTC ydbd size 2.3 GiB changed* by +114.4 KiB, which is >= 100.0 KiB vs main: Warning

ydbd size dash	main: 05744b7	merge: 3b9aec4	diff	diff %
ydbd size	2 496 689 288 Bytes	2 496 806 424 Bytes	+114.4 KiB	+0.005%
ydbd stripped size	530 818 272 Bytes	530 839 296 Bytes	+20.5 KiB	+0.004%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}

[github-actions]

⚪ 2026-01-07 15:33:39 UTC Pre-commit check linux-x86_64-release-asan for 3b9aec4 has started.
⚪ 2026-01-07 15:33:58 UTC Artifacts will be uploaded here
⚪ 2026-01-07 15:36:10 UTC ya make is running...
🟡 2026-01-07 17:37:24 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
15932	15703	0	121	85	23

🟢 2026-01-07 17:37:34 UTC Build successful.
🟡 2026-01-07 17:38:06 UTC ydbd size 3.8 GiB changed* by +192.7 KiB, which is >= 100.0 KiB vs main: Warning

ydbd size dash	main: 05744b7	merge: 3b9aec4	diff	diff %
ydbd size	4 105 811 200 Bytes	4 106 008 560 Bytes	+192.7 KiB	+0.005%
ydbd stripped size	1 535 920 368 Bytes	1 535 987 632 Bytes	+65.7 KiB	+0.004%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}