Fix reading big messages in Kafka Proxy (from #18079)

[a-serebryanskiy]

Changelog entry

Moved changes from: #18079

Issue: #18116

This PR fixes optimisation in NKikimr::NRawSocket::TBufferedWriter, that wrote the entire message directly to socket if message was larger than available space in buffer. When we wrote more than 6mb to socket with SSL enabled, it every time returned -11 (WAGAIN).
As a quick fix, we replace sending of an entire message to socket with cutting this message into 1mb chunks and sending them to socket one by one.

Changelog category

• Bugfix

Description for reviewers

...

[github-actions]

⚪ 2025-05-07 09:32:27 UTC Pre-commit check linux-x86_64-relwithdebinfo for 53595b9 has started.
⚪ 2025-05-07 09:32:51 UTC Artifacts will be uploaded here
⚪ 2025-05-07 09:36:25 UTC ya make is running...
🟡 2025-05-07 10:40:12 UTC Some tests failed, follow the links below. Going to retry failed tests...

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
20569	19283	0	9	1213	64

⚪ 2025-05-07 10:42:02 UTC ya make is running... (failed tests rerun, try 2)
🟢 2025-05-07 11:03:39 UTC Tests successful.

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

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
139 (only retried tests)	78	0	0	0	61

🟢 2025-05-07 11:03:46 UTC Build successful.
🟢 2025-05-07 11:04:06 UTC ydbd size 2.1 GiB changed* by -16.4 KiB, which is <= 0 Bytes vs stable-25-1-1: OK

ydbd size dash	stable-25-1-1: f642a67	merge: 53595b9	diff	diff %
ydbd size	2 243 548 816 Bytes	2 243 532 000 Bytes	-16.4 KiB	-0.001%
ydbd stripped size	475 082 168 Bytes	475 080 888 Bytes	-1.2 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}

[github-actions]

⚪ 2025-05-07 09:35:11 UTC Pre-commit check linux-x86_64-release-asan for 53595b9 has started.
⚪ 2025-05-07 09:35:22 UTC Artifacts will be uploaded here
⚪ 2025-05-07 09:38:10 UTC ya make is running...
🟡 2025-05-07 10:49:02 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet Going to retry failed tests...

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
13465	13402	0	19	9	35

⚪ 2025-05-07 10:50:12 UTC ya make is running... (failed tests rerun, try 2)
🟡 2025-05-07 11:10:58 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet Going to retry failed tests...

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

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
97 (only retried tests)	61	0	1	1	34

⚪ 2025-05-07 11:11:06 UTC ya make is running... (failed tests rerun, try 3)
🟡 2025-05-07 11:31:34 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet

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

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
64 (only retried tests)	30	0	1	0	33

🟢 2025-05-07 11:31:41 UTC Build successful.
🟢 2025-05-07 11:32:07 UTC ydbd size 3.6 GiB changed* by -19.7 KiB, which is <= 0 Bytes vs stable-25-1-1: OK

ydbd size dash	stable-25-1-1: f642a67	merge: 53595b9	diff	diff %
ydbd size	3 902 626 696 Bytes	3 902 606 512 Bytes	-19.7 KiB	-0.001%
ydbd stripped size	1 365 663 408 Bytes	1 365 662 512 Bytes	-896 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}