FTS5 highlight/snippet nullable #3161

Job	Run time
setup / Get and cache Dart dependencies	30s
setup / Compile sqlite3 for tests (ubuntu-latest)	5s
setup / Compile sqlite3 for tests (macos-latest)	8s
setup / Compile sqlite3 for tests (windows-latest)	38s
drift_dev	6m 55s
Integration tests for migration tooling	1m 13s
Documentation	4m 29s
drift package	2m 16s
Integration tests	3m 2s
sqlparser	45s
test_flutter (3.24)	2m 14s
test_flutter (3.27)	1m 58s
Drift web unit tests, dart2wasm, chrome	3m 44s
drift_web_ddc	3m 35s
Web integration tests	4m 0s
Drift web unit tests, dart2wasm, firefox	4m 15s
	39m 47s

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