Feature request: stable sort in normalization ASTs

* I would love it if fields in normalization ASTs were sorted stably, probably in the order: __typename, id, scalar and linked fields sorted by alias, inline fragments, misc
* We generate inlined queries from normalization ASTs in JS, so this is somewhat slow. (~1.5s for ~300 queries). It's quite nice to be able to see the effect your changes had
* But, if the fields aren't stably sorted, changes (like removing a fragment) shuffle fields around, making the diff less informative

No big deal, just a suggestion.