* [ASDataController] Add some assertions to clarify what queues things happen on
* [ASCollectionDataController] Optimize willReloadData
* [ASDataController] Minor optimizations, no functional changes
* [ASDataController] Always reload data on _editingTransactionQueue
* [ASDataController] Remove async data fetching option, deprecate callbacks
* [ASDataController] Not mutable
* [ASMultidimensionalArrayUtils] Use fast enumeration
* Optimize ASMultidimensionalArrayUtils
The optimization seems correct now, but apps like Pinterest have some core code relying on edit operation
order that is actually not permitted by UIKit (and this diff) but were tolerated previously. We will
re-land this once we have time to adapt the code.
