Add connection and context to connected hook payload

[canadaduane]

Adds connection and context to the connectedPayload type for the connected hook.

Because connectedPayload already has connection (ConnectionConfiguration), if this PR intention is acceptable, we have the choice of either:

(a) make the most sensible change, but require a breaking change (i.e. bump the major version)
(b) make the least disruptive change, but add a key that could be a little confusing / misdirecting

This PR currently applies choice (a), but it could easily be switched. See #606.

[janthurau]

Thanks for this!

Let's take the 2nd choice for now (no BC break), maybe we can just name it connectionInstance (or you have a better idea :)). The naming won't be that nice but I don't want to bump the major just because we rename one variable.. Maybe you can add an @todo so we rename it in the next major (that might be with subdocs, #583). Happy to merge then!

[canadaduane]

maybe we can just name it connectionInstance

add an @todo so we rename it in the next major

Done! Thanks for the feedback.