Fetch the closest resource before the timestamp rather than closest before or after in the cheqd resolved

[TimoGlastra]

In the resolver we currently find the closes resource before or after a timestamp. But for AnonCreds revocation status list it's important we pick the closest before the given timestamp, as that's when the status list was active.

cc @DaevMithran

[DaevMithran]

@TimoGlastra what should be the result when the timestamp provided is earlier than the statuslist creation date? Should we throw an error?

[TimoGlastra]

Yes I think an error should be thrown in that case, do you see other options that would work?