Add `GenerateAdapters` annotation #237

Job	Run time
test-hive (vm, kernel)	57s
code-quality (hive, stable)	1m 18s
test-hive_flutter (stable)	52s
test-hive (chrome, dart2js)	3m 58s
code-quality (hive, beta)	1m 16s
test-hive (chrome, dart2wasm)	2m 47s
test-hive_flutter (beta)	53s
code-quality (hive_flutter, stable)	1m 23s
code-quality (hive_flutter, beta)	1m 27s
test-hive_generator (stable, ubuntu-latest)	3m 56s
code-quality (hive_generator, stable)	1m 16s
check-score (hive)	1m 33s
ensure-codegen	3m 3s
test-hive_generator (stable, windows-latest)	3m 48s
code-quality (hive_generator, beta)	1m 13s
check-score (hive_flutter)	2m 3s
test-hive_generator (beta, ubuntu-latest)	3m 56s
check-score (hive_generator)	2m 15s
ensure-embedme	7s
	38m 1s

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