feat: add typehint on adapter #304

Job	Run time
Build (8.0)	29s
Adapter (8.2, async-aws/simple-s3:^1.0, spec/Gaufrette/Adapter/AsyncAwsS3Spec.php)	26s
Build (8.1)	25s
Adapter (8.2, aws/aws-sdk-php:^3.158, spec/Gaufrette/Adapter/AwsS3Spec.php)	27s
Build (8.2)	18s
Adapter (8.2, google/apiclient:^2.12, spec/Gaufrette/Adapter/GoogleCloudStorageSpec.php)	1m 10s
Adapter (8.2, doctrine/dbal:^2.3, spec/Gaufrette/Adapter/DoctrineDbalSpec.php)	23s
Adapter (8.2, doctrine/dbal:^3.4, spec/Gaufrette/Adapter/DoctrineDbalSpec.php)	23s
Adapter (8.2, league/flysystem:^1.0, spec/Gaufrette/Adapter/FlysystemSpec.php)	20s
Adapter (8.2, microsoft/azure-storage-blob:^1.0, spec/Gaufrette/Adapter/AzureBlobStore)	25s
Adapter (8.2, mongodb/mongodb:^1.1, spec/Gaufrette/Adapter/GridFSSpec.php)	15s
Adapter (8.2, phpseclib/phpseclib:^2.0, spec/Gaufrette/Adapter/PhpseclibSftpSpec.php)	24s
	5m 25s

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