NewAWSUserKeyStore initializes a new KeyStore targeting the given user targeting the specific client.

NewOnlyValidKeys creates a new KeyStore only allowing the access key IDs specified in validKeys to be consideredcurrent.

AWSAccessKey is a paired down interpretation of the AWS API suitable to be used as rotation.Key in a rotation.KeyStore.

AWSUserKeyStore is a bridge between AWS and rotation.KeyStore system, translating the calls into the AWS client scopedto a specific user.

StringSlice wraps a primitive string slice to provide additional utilitiesTODO: See if there is a library which already implements these.