feat(query-core): add MutationFunctionContext argument to mutateFn

[travikk]

This PR adds new argument to mutateFn allowing for access to queryClient as well as meta object.

This feature should make it easier to attach authentication headers from within mutateFn, that would typically live in QueryCache. Currently that's made very difficult and requires either having singleton context in the codebase or requiring consumers of mutations to pass auth token each time.

This PR also makes it more similar to how queryFn behaves, in that it accepts QueryFunctionContext.

Note: I wasn't entirely sure about the name of MutateFunctionContext, but ultimately I decided to go ahead with that name to mirror the way queryFn behaves. I realise this might be suboptimal, due to there already existing a TContext for mutations. Happy to discuss and take direction here.