AwsRequestPreSigner
fun AwsRequestPreSigner(scope: AwsCredentialScope, credentials: AwsCredentials, clock: Clock = Clock.systemUTC()): AwsPreRequestSigner
fun AwsRequestPreSigner(scope: AwsCredentialScope, credentialsProvider: () -> AwsCredentials, clock: Clock = Clock.systemUTC()): AwsPreRequestSigner