25-1: CreateDatabase: support specifying the number of coordinators/mediators

[snaury]

Changelog entry

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Changelog category

• Not for changelog (changelog entry is not required)

Description for reviewers

Support specifying the number of coordinators/mediators in the CreateDatabase request as a way to very large databases.

Merges #15415.

[github-actions]

🟢 2025-03-28 09:19:34 UTC The validation of the Pull Request description is successful.

[github-actions]

⚪ 2025-03-28 09:20:07 UTC Pre-commit check linux-x86_64-release-asan for 4c3113d has started.
⚪ 2025-03-28 09:20:23 UTC Artifacts will be uploaded here
⚪ 2025-03-28 09:23:35 UTC ya make is running...
🟡 2025-03-28 11:22:06 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet Going to retry failed tests...

Details

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
14512	14384	0	86	6	36

⚪ 2025-03-28 11:24:04 UTC ya make is running... (failed tests rerun, try 2)
🟢 2025-03-28 11:51:35 UTC Tests successful.

Test history | Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
178 (only retried tests)	145	0	0	0	33

🟢 2025-03-28 11:51:44 UTC Build successful.
🟢 2025-03-28 11:52:12 UTC ydbd size 3.6 GiB changed* by +4.6 KiB, which is < 100.0 KiB vs stable-25-1: OK

ydbd size dash	stable-25-1: 0f03672	merge: 4c3113d	diff	diff %
ydbd size	3 902 686 712 Bytes	3 902 691 416 Bytes	+4.6 KiB	+0.000%
ydbd stripped size	1 365 767 344 Bytes	1 365 767 696 Bytes	+352 Bytes	+0.000%

^{*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]

⚪ 2025-03-28 09:21:30 UTC Pre-commit check linux-x86_64-relwithdebinfo for 4c3113d has started.
⚪ 2025-03-28 09:21:34 UTC Artifacts will be uploaded here
⚪ 2025-03-28 09:24:52 UTC ya make is running...
🟡 2025-03-28 11:09:17 UTC Some tests failed, follow the links below. Going to retry failed tests...

Details

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
28798	26205	0	2	2459	132

⚪ 2025-03-28 11:11:48 UTC ya make is running... (failed tests rerun, try 2)
🟢 2025-03-28 11:40:36 UTC Tests successful.

Test history | Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
197 (only retried tests)	67	0	0	1	129

🟢 2025-03-28 11:40:46 UTC Build successful.
🟢 2025-03-28 11:41:09 UTC ydbd size 2.1 GiB changed* by +3.2 KiB, which is < 100.0 KiB vs stable-25-1: OK

ydbd size dash	stable-25-1: 0f03672	merge: 4c3113d	diff	diff %
ydbd size	2 243 452 656 Bytes	2 243 455 968 Bytes	+3.2 KiB	+0.000%
ydbd stripped size	475 097 880 Bytes	475 098 072 Bytes	+192 Bytes	+0.000%

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