Include Altair GraphQL view

I would love to be able to use [Altair GraphQL Client](https://altair.sirmuel.design/) as a view like the GraphiQL view, especially since it provides several extra features than the normal graphiql (like file uploading, setting headers, etc). Would it be possible to include a view for Altair?

Ps: I'm also open to making a contribution myself as well, if you guys agree for that. 🙂

Start by locating the existing GraphiQL view in the Flask integration and inspect how it is registered and rendered. Add an Altair view with the requested GraphQL client features, then verify that it can be used alongside the existing GraphiQL view.

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