Generate operation calls that replace input shape with parameters

[adam-fowler]

Corresponding soto-codegenerator PR is soto-project/soto-codegenerator#81

These are service files generated with additional operation calls that replace the input shape with parameters.
This makes for a nicer api than the create request, pass request into operation function. eg

let response = try await s3.getObject(bucket: "my-bucket", key: "my-file")

added as an alternative to

let request = S3.GetObjectRequest(bucket: "my-bucket", key: "my-file")
let response = try await s3.getObject(request)

I've also flagged everything as @inlinable so an optimised build should collapse down to the raw AWSClient.execute call