FR: Add support for GH Discussions

[vickyyyyyyy]

GH has moved their feature requests/feedback over to Discussions and similarly, Grafana has also done the same.

It would be great for us to be able to use this plugin to be able to visualize Discussions information to get a high level overview of everything across different projects/plugins.

Possible solution includes using their GraphQL API to get the data back: https://docs.github.com/en/graphql/guides/using-the-graphql-api-for-discussions