Use fbsource clang-format config

Summary:
This mirrors the clang-format config used by fbsource to Yoga.

They are pretty similar, except for an annoying habit where Yoga's previous forced small functions in headers to be a a single line, so you would get a combination of multiline and single line functions next to each other which are hard to read. That is what motivated this change.

It also enforces header ordering (yay). I don't think we have any side-effect causing headers, so this should be safe.

Reviewed By: yungsters

Differential Revision: D49248994

fbshipit-source-id: 66998395e7c0158ff9d9fb1bee44e8401bdd8f21

tests/util/TestUtil.cpp

@@ -7,8 +7,8 @@
 
 #include "TestUtil.h"
 
-#include <yoga/node/Node.h>
 #include <yoga/event/event.h>
+#include <yoga/node/Node.h>
 
 namespace facebook::yoga::test {
 
@@ -20,7 +20,6 @@ void yogaEventSubscriber(
     YGNodeConstRef /*node*/,
     Event::Type eventType,
     const Event::Data& /*eventData*/) {
-
   switch (eventType) {
     case Event::NodeAllocation:
       nodeInstanceCount++;