Automatically label GitHub issues

[Piedone]

Is your feature request related to a problem? Please describe.

Labels help find related issues, like ones for GraphQL. However, adding labels is a chore, can only be done by a core contributor, and it's infrequent that we actually remember doing it.

Describe the solution you'd like

Try an auto-label solution like https://github.com/github/issue-labeler or https://github.com/Renato66/auto-label.

Describe alternatives you've considered

You can also use text search to find issues, of course, but an issue containing e.g. the "GraphQL" text doesn't necessarily actually mean that the issue is for the GraphQL module. This is also a problem with auto-labeling: a human needs to check. But that's still easier (and more apparent to do) than adding labels.