base: move TCompactionPolicy out of flat_scheme_op.proto

[ijon]

Move TCompactionPolicy from flat_scheme_op.proto to distinct .proto file.

The final goal is to break dependency of ydb/core/base/ on flat_scheme_op.pb.h.
Currently, flat_scheme_op.proto contains few fundamental structures essential for ydb/core/base/, alongside numerous higher-level components (scheme entities descriptions, scheme operations) that are irrelevant to ydb/core/base/'s needs.

This is part of "improve schemeshard operation build-time" effort (#10633).

Changelog category

• Not for changelog

[github-actions]

⚪ 2024-10-16 19:33:33 UTC Pre-commit check linux-x86_64-release-asan for b0aae10 has started.
⚪ 2024-10-16 19:33:44 UTC Artifacts will be uploaded here
⚪ 2024-10-16 19:37:11 UTC ya make is running...
🟡 2024-10-16 21:30:10 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
12019	11741	0	85	93	100

🟢 2024-10-16 21:31:10 UTC Build successful.
🟢 2024-10-16 21:31:45 UTC ydbd size 5.7 GiB changed* by -816 Bytes, which is <= 0 Bytes vs main: OK

ydbd size dash	main: 09bef8a	merge: b0aae10	diff	diff %
ydbd size	6 129 681 016 Bytes	6 129 680 200 Bytes	-816 Bytes	-0.000%
ydbd stripped size	1 529 354 544 Bytes	1 529 355 472 Bytes	+928 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]

⚪ 2024-10-16 19:33:35 UTC Pre-commit check linux-x86_64-relwithdebinfo for b0aae10 has started.
⚪ 2024-10-16 19:33:45 UTC Artifacts will be uploaded here
⚪ 2024-10-16 19:37:04 UTC ya make is running...
🟡 2024-10-16 21:03:25 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?
41774	36171	0	7	5492	104

⚪ 2024-10-16 21:07:04 UTC ya make is running... (failed tests rerun, try 2)
🟢 2024-10-16 21:18:31 UTC Tests successful.

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

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
119 (only retried tests)	21	0	0	1	97

🟢 2024-10-16 21:18:38 UTC Build successful.
🟢 2024-10-16 21:18:56 UTC ydbd size 2.8 GiB changed* by +3.1 KiB, which is < 100.0 KiB vs main: OK

ydbd size dash	main: 09bef8a	merge: b0aae10	diff	diff %
ydbd size	3 028 485 792 Bytes	3 028 489 000 Bytes	+3.1 KiB	+0.000%
ydbd stripped size	480 129 496 Bytes	480 133 752 Bytes	+4.2 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}