S3 express one bucket support

[adam-fowler]

Create new client and s3 service for accessing S3 express one bucket zonal endpoints. This PR requires soto-project/soto-core#629 to work

let client = AWSClient()
let s3 = S3(client: client)
let bucket = "my-bucket--euw1-az1--x-s3"
// Create directory bucket
try await Self.s3.createBucket(
    bucket: bucket,
    createBucketConfiguration: .init(
        bucket: .init(dataRedundancy: .singleAvailabilityZone, type: .directory),
        location: .init(name: "euw1-az1", type: .availabilityZone)
    )
)
// need s3Express client to access directory bucket
let (expressClient, expressS3) = s3.createS3ExpressClientAndService(bucket: bucket)
let response = try await expressS3.getObject(bucket: bucket, key: "my-file")
try await expressClient.shutdown()
try await client.shutdown()