Support logging the statistics of a type of object based on a partial URI.

Michael, the "interesting" thing here is walking the list of handles while holding the schema lock, and opening a cursor to get the statistics while holding that lock.

We could get trickier so we hold the lock for a shorter period of time: if you think that's worth doing let's talk it over and I'll make that change.   I thought about it, but I don't think opening/closing files, and/or checkpoints, are that frequent with respect to stats logging?

Otherwise I think this change is good to go.