feat: pass associated oauth client data to token hook

[terev]

Enables passing a sanitized copy of the associated oauth client to token hooks. I left the ClientID parameter as is to avoid this being a breaking change.

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• [x] I have referenced an issue containing the design document if my change introduces a new feature.
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[terev]

@aeneasr I've reduced the scope of this mr to just passing the oauth client to the token hook, as it seems like the extra parameters part of the original motivation was controversial. I would still be very interested to hear your thoughts on this if you have any.