[FEATURE] (type-safe-api) Support service-less TypeSafeApiModelProject

[steven-taglohner]

Describe the feature

Instantiate shared common structures (TypeSafeApiModelProject) without having to defined a Smithy service.

Use Case

Defining a common structure without the need of a service is useful in the scenario where the common structure is solely used to declare structures shared across various API’s.

Proposed Solution

For service-less projects:

1. Don’t generate OpenAPI projections
2. Don’t run parse-openapi-spec script

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

PDK version used

0.23.26

What languages will this feature affect?

Typescript

Environment details (OS name and version, etc.)

UNIX-based