Pass the collection epoch and timestamp when building a ChunkType from a config.chunks BSON

This is the first step towards getting rid of epochs and timestamps in config.chunks.

The task here is extending ChunkType::fromConfigBSON method with the collection epoch and collection timestamp.

Ideally we would like to check that the epoch/timestamp in disk and the ones being passed are the same. However I believe that this is not possible in some situations: the config CC loader can see inconsistencies between config.collections and config.chunks right now.