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

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[github-actions]

⚪ 2025-05-07 08:48:14 UTC Pre-commit check for 2335076 has started.
⚪ 2025-05-07 08:50:56 UTC Build linux-x86_64-release-asan is running...
🟢 2025-05-07 09:15:21 UTC Build successful.
⚪ 2025-05-07 09:15:39 UTC Tests are running...
🔴 2025-05-07 11:32:09 UTC Some tests failed, follow the links below.

Test history | Test log

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
11629	11530	0	32	26	41

🟢 2025-05-07 11:32:53 UTC ydbd size 5.6 GiB changed* by -36.5 KiB, which is <= 0 Bytes vs stable-24-4: OK

ydbd size dash	stable-24-4: 6d4b851	merge: 2335076	diff	diff %
ydbd size	6 028 297 192 Bytes	6 028 259 784 Bytes	-36.5 KiB	-0.001%
ydbd stripped size	1 508 555 072 Bytes	1 508 554 880 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}

[github-actions]

⚪ 2025-05-07 09:23:24 UTC Pre-commit check for 2335076 has started.
⚪ 2025-05-07 09:25:58 UTC Build linux-x86_64-relwithdebinfo is running...
🟢 2025-05-07 10:05:40 UTC Build successful.
⚪ 2025-05-07 10:05:56 UTC Tests are running...
🔴 2025-05-07 11:34:52 UTC Some tests failed, follow the links below.

Test history | Test log

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
16070	14710	0	21	1300	39

🟢 2025-05-07 11:35:45 UTC ydbd size 8.3 GiB changed* by -121.9 KiB, which is <= 0 Bytes vs stable-24-4: OK

ydbd size dash	stable-24-4: 6d4b851	merge: 2335076	diff	diff %
ydbd size	8 899 108 176 Bytes	8 898 983 360 Bytes	-121.9 KiB	-0.001%
ydbd stripped size	485 044 680 Bytes	485 043 464 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}