allow to configure min alloc size (#7951)

[gridnevvvit]

Changelog entry

currently mkql allocator makes requests by chunks of 30MiB minimum, so making that configurable and changing that limit to 8MiB.

also minimal 'free' quota is 1MiB because of alignment rules (mkql aligns in 1MiB)

Changelog category

• Improvement

Additional information

...

[github-actions]

⚪ 2024-08-19 10:04:05 UTC Pre-commit check for 5d09c23 has started.
⚪ 2024-08-19 10:06:47 UTC Build linux-x86_64-release-clang14 is running...
🟢 2024-08-19 10:36:00 UTC Build successful.

[github-actions]

⚪ 2024-08-19 10:04:15 UTC Pre-commit check for 5d09c23 has started.
⚪ 2024-08-19 10:07:00 UTC Build linux-x86_64-relwithdebinfo is running...
🟢 2024-08-19 11:04:36 UTC Build successful.
⚪ 2024-08-19 11:04:53 UTC Tests are running...
🔴 2024-08-19 12:48:56 UTC Some tests failed, follow the links below.

Test history | Test log

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
39792	34567	0	2	5213	10

🟢 2024-08-19 12:49:35 UTC ydbd size 8.1 GiB changed* by +18.7 KiB, which is < 100.0 KiB vs stable-24-3: OK

ydbd size dash	stable-24-3: e7ccd59	merge: 5d09c23	diff	diff %
ydbd size	8 724 471 240 Bytes	8 724 490 424 Bytes	+18.7 KiB	+0.000%
ydbd stripped size	476 926 664 Bytes	476 930 856 Bytes	+4.1 KiB	+0.001%

^{*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]

⚪ 2024-08-19 10:04:19 UTC Pre-commit check for 5d09c23 has started.
⚪ 2024-08-19 10:07:07 UTC Build linux-x86_64-release-asan is running...
🟢 2024-08-19 10:48:12 UTC Build successful.
⚪ 2024-08-19 10:48:27 UTC Tests are running...
🔴 2024-08-19 12:40:00 UTC Some tests failed, follow the links below.

Test history | Test log

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
11244	11197	0	8	27	12

🟢 2024-08-19 12:40:45 UTC ydbd size 5.5 GiB changed* by +15.0 KiB, which is < 100.0 KiB vs stable-24-3: OK

ydbd size dash	stable-24-3: e7ccd59	merge: 5d09c23	diff	diff %
ydbd size	5 904 613 600 Bytes	5 904 628 960 Bytes	+15.0 KiB	+0.000%
ydbd stripped size	1 480 290 208 Bytes	1 480 294 944 Bytes	+4.6 KiB	+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}