feat: Add `KeyValueStoreClient.record_exists` (#427) #119

Job	Run time
Prepare release metadata	9s
Lint check / Lint check (3.9)	13s
Lint check / Lint check (3.12)	12s
Lint check / Lint check (3.10)	12s
Type check / Type check (3.9)	16s
Lint check / Lint check (3.11)	9s
Async dostrings check / Async docstrings check	16s
Type check / Type check (3.10)	19s
Type check / Type check (3.11)	18s
Lint check / Lint check (3.13)	13s
Unit tests / Unit tests (ubuntu-latest, 3.9)	31s
Unit tests / Unit tests (ubuntu-latest, 3.13)	33s
Unit tests / Unit tests (ubuntu-latest, 3.12)	32s
Unit tests / Unit tests (windows-latest, 3.13)	1m 10s
Unit tests / Unit tests (windows-latest, 3.12)	1m 15s
Type check / Type check (3.13)	18s
Unit tests / Unit tests (windows-latest, 3.10)	54s
Type check / Type check (3.12)	15s
Unit tests / Unit tests (ubuntu-latest, 3.10)	34s
Unit tests / Unit tests (ubuntu-latest, 3.11)	29s
Integration tests / Integration tests (3.13)	19s
Unit tests / Unit tests (windows-latest, 3.9)	53s
Integration tests / Integration tests (3.9)	12s
Unit tests / Unit tests (windows-latest, 3.11)	1m 13s
Integration tests / Approve integration tests for PRs from forks	0s
Integration tests / Integration tests for PRs from forks	0s
Update changelog / bump_and_update_changelog	15s
Publish to PyPI	32s
	12m 12s

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