Allow API consumer to download client code

[bajiat]

Use Swagger codegen API for creating a small UI for client code SDK download based on Swagger file.

User story

As an API consumer
I want to download an SDK for my API in the language which I am using
so that I can start developing the client code based on the API design and don't have to start development from scratch

Definition of done

• User can select a programming language for which they download the SDK for the Swagger file they have open on the UI (potential options: dropdown menu for all languages or buttons for most popular languages, rest in dropdown)
• User can take an action (e.g. press the button) to download
• After the user takes the action, a zip file is downloaded

Wireframe

[marla-singer]

@bajiat I will work in this repository https://github.com/2glab/sdk-generator

[marla-singer]

@bajiat The main task is ready. In progress: handling errors

[Nazarah]

@marla-singer : hey! lets discuss in rocket chat about integrating the test UI in the APINF. I need your opinion while designing the wireframe. :)