Add `GenerateAdapters` annotation #239

Job	Run time
check-score (hive)	1m 30s
ensure-codegen	2m 57s
code-quality (hive, stable)	1m 18s
check-score (hive_flutter)	2m 13s
ensure-embedme	5s
code-quality (hive, beta)	1m 32s
check-score (hive_generator)	2m 21s
code-quality (hive_flutter, stable)	1m 59s
test-hive (vm, kernel)	55s
test-hive (chrome, dart2js)	4m 17s
code-quality (hive_flutter, beta)	1m 23s
test-hive_flutter (stable)	49s
test-hive_generator (stable, ubuntu-latest)	4m 3s
test-hive (chrome, dart2wasm)	2m 42s
code-quality (hive_generator, stable)	1m 22s
test-hive_flutter (beta)	59s
test-hive_generator (stable, windows-latest)	5m 37s
code-quality (hive_generator, beta)	1m 14s
test-hive_generator (beta, ubuntu-latest)	3m 58s
	41m 14s

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