Implement Starlette bindings

Starlette is lightweight framework for implementing asynchronous APIs/apps in Python. It already has GraphQL support (via Graphene) but the feature and dependencies are opt-in, leaving space for alternative GraphQL implementation in the project.

We’ve discussed this with @tomchristie who leads work on Starlette and path is open for us to introduce the built-in support for Ariadne in Starlette via PR. This issue is for tracking possible ariadne.contrib.starlette module/package that would provide necessary bindings on our side.

[tomchristie]

👍 I’m available if you’ve questions about how to proceed on this.

Its not clear to me yet if we’d end up including it in Starlette’s package or if we’d end up having both the Ariadne and the Graphene variants as third party either way I’d be perfectly happy to take pull requests against the Starlette cocdebase as a starting point for validating the implementation.

Also worth saying here that the goal is Ariadne being available for any ASGI framework. Starlette is the package you’d use to facilitate that, and is one framework you’d be able to use, but we should also keep an eye on “and here’s how you can use it with Quart, Responder, and (once it updates to an ASGI interface) Sanic”.

[tomchristie]

Sure - Starlette 0.12 is basically ready to go - I’ve just been in a different headspace what with pushing hard on httpcore. I guess I’ll come to releasing it next week at the latest.