Add a ReportType for hate speech

[ctrlcctrlv]

It's such a common problem that it deserves to be in your schema.

Even if not all services disallow it, they can just filter ReportType=HateSpeech instead of having to deal with XARF's in other categories.

You're not taking a political position by including it, so please do it.

[FrederikP]

see my comment here: https://github.com/abusix/xarf/issues/34#issuecomment-1124983349