Basic Open API implementation

[Cobolt77]

@rknell Created a PR instead of an issue to demonstrate the proof of concept.
The idea would be to make Alfred compatible with OpenAPI to use with softwares like Insomnia and Postman aswell as providing clean documentation for external developers to one's project.

Before going too far and doing a complete (and clean!) implementation of this, I wanted your take on this.

The way I see this, it would add an optionnal route parameter called "openAPIDoc" in which you could specify more details about the route. By default, it would at least render the path and path parameter.

Looking at my example, a simple route could be instantiated to open the OpenAPI document to the public.

As I mentionned, it's only a PoC before doing an actual implementation of this.
Is this something you would want in Alfred?

Thanks!

As a side note, below is a screenshot of the outputed file (left) and used with swagger (right)