Pass request through go context

[mitar]

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

We use clients which are scoped to audience parameter (we require to be) passed to endpoints. The storage GetClient gets only client ID to resolve the client. We currently add audience parameter to context ctx and then use that (go has WithValue).

Describe the solution you'd like

I think fosite could just automatically for all requests (and responses, once they are ready) store them on ctx as well. It is pretty good on passing ctx around, request (and response) are naturally linked to ctx anyway. That should be pretty simple change in all codepaths where request and responses are made, we store a pointer to them also into ctx under some fosite-namespaced keys.

Describe alternatives you've considered

We are currently passing that ourselves, but it leads to a bit of duplication code in query preprocessing.

Additional context

I can make a PR for this if acked.

[mitar]

@aeneasr What do you think about this?

[aeneasr]

Yup we could do that - just keep in mind that things like the body can only be read once