Allow ad-hoc connections on a per-operation basis

A new feature request that came up is that in addition to specifying the connection up front, it should be possible to provide the connection information on a per-operation basis.

The proposal is to latch this onto the new ConnectionIdentifier feature, and if it is a URI/Connection String, extract all the necessary information from there and spin up a connection. A UUID/hashCode connection identifier that is temporary can be chosen as an example.

One important property is that if the connection identifier / URI Is the same, it should be reused like the other connections and shut down when the application is terminated.