Send mouseUp events for NSTabView (#2112)

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## Summary:

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problem does the pull request solve? -->

Fix for issue #2111 (NSTabView doesn't send mouseUp event because it
doesn't inherit from NSControl).

NSTabView inherits from NSView, not NSControl, so its click events
aren't recorded in the _nativeTouches cache leading to mouseUp and
mouseDown not firing consistently when clicking on the tab buttons.

## Test Plan:

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Code for custom TabView component provided in the linked issue.

packages/react-native/React/Base/RCTTouchHandler.m

@@ -137,6 +137,9 @@ - (void)_recordNewTouches:(NSSet *)touches
     // Pair the mouse down events with mouse up events so our _nativeTouches cache doesn't get stale
     if ([targetView isKindOfClass:[NSControl class]]) {
       _shouldSendMouseUpOnSystemBehalf = [(NSControl*)targetView isEnabled];
+    } else if ([targetView isKindOfClass:[NSTabView class]]) {
+      // NSTabView sends click events for tab buttons but doesn't inherit from NSControl
+      _shouldSendMouseUpOnSystemBehalf = YES;
     } else if ([targetView isKindOfClass:[NSText class]]) {
       _shouldSendMouseUpOnSystemBehalf = [(NSText*)targetView isSelectable];
     }