Issue #

awslabs/aws-sdk-swift#1458

Description of changes

Removes the namespace around nested model types to reduce boilerplate and simplify service clients. Results in the following changes to a service's models:

• Input and output structures are renamed to end in OperationInput and OperationOutput (to resolve name collision with a couple services that have names that clash with the current Input and Output names.)
• Model types that are not top-level (i.e. in a property or sub-property of an input, output, or error) are no longer namespaced to ServiceClientTypes and are created in the root namespace of the service.
• Error structures are unchanged.

Specific changes made to support:

• The NestedTrait and the transformer that applies it are removed, since no models are nested anymore.
• Removes code that renders models and their extensions in a namespace.
• Fixes many references to runtime types so that they use the fully qualified name, to avoid unresolvable ambiguity with modeled types of the same name.
• Changes the name of input / output type name suffix from Input and Output to OperationInput and OperationOutput. This was needed to avoid name collisions after renaming.

Note: Many codegen tests are broken due to changed names. Will fix once we settle on naming structure.

Scope

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.