Support for prompt=select_account

[vTrip]

If not already in pipeline (or if I've missed this in the documentation for authkit), it would be great to be able to configure the search param value for prompt to flow through to the chosen IDP in AuthKit flow.

I'd like to be able to configure my authkit login URL such that the IDP knows to always show account selection to users when logging in.

Currently, upon logging the user out, if they log in immediately with the same IDP chosen from previous logged out session, the IDP is auto logging in that user based on the IDPs own session management.

Overriding this would be a great addition to AuthKit.

Thanks!