We need an interface to do updateWithDamages when we have both a DamageVector and BSONObj representing the new value. We need to be able to pass the updated BSONObj to IndexCatalog::updateRecord and the validator.

Consider adding a slightly different DamageVector/DamageEvent types that don't require all target buffers to be located in a single contiguous buffer.

The current updateWithDamages API is not allowed to use when there are a validator set on the Collection. https://github.com/mongodb/mongo/blob/master/src/mongo/db/catalog/collection_impl.cpp#L1235