Fix `toString()` not escaping class names #3188

Job	Run time
setup / Compile sqlite3 for tests (ubuntu-latest)	7s
setup / Get and cache Dart dependencies	28s
setup / Compile sqlite3 for tests (macos-latest)	7s
setup / Compile sqlite3 for tests (windows-latest)	12s
drift package	2m 6s
sqlparser	46s
drift_dev	7m 16s
Documentation	5m 7s
Integration tests for migration tooling	1m 8s
Integration tests	2m 57s
test_flutter (3.27)	2m 11s
Web integration tests	4m 30s
Drift web unit tests, dart2wasm, chrome	3m 48s
Drift web unit tests, dart2wasm, firefox	4m 28s
drift_web_ddc	3m 43s
	38m 54s

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