chore(fabric): implement focus view props (#2692)

Needs #2690 to land first.

## Summary:

Implement focus on RCTViewComponentView. Much of the implementation is
taken from #1437, #2117 and comparing against `RCTView`. The border path
used for `drawFocusRingMask` is the same as what is used for box shadows
and cursors.

## Test Plan:

The focus loop seems nonexistent on both paper and Fabric in RNTester...
but I can verify that calling `ref.current?/.focus()` on a Pressable
displays the focus ring

Author: Saadnajmi

packages/react-native/React/Fabric/Mounting/ComponentViews/View/RCTViewComponentView.mm

@@ -1510,6 +1510,73 @@ - (BOOL)didActivateAccessibilityCustomAction:(UIAccessibilityCustomAction *)acti
   }
 }
 
+#if TARGET_OS_OSX // [macOS
+
+# pragma mark - Focus Ring
+
+- (CGRect)focusRingMaskBounds
+{
+  return [self bounds];
+}
+
+- (void)drawFocusRingMask
+{
+  if (_props->enableFocusRing) {
+    CGContextRef context = NSGraphicsContext.currentContext.CGContext;
+
+    const auto borderMetrics = _props->resolveBorderMetrics(_layoutMetrics);
+    const RCTCornerInsets cornerInsets =
+        RCTGetCornerInsets(RCTCornerRadiiFromBorderRadii(borderMetrics.borderRadii), UIEdgeInsetsZero);
+    CGPathRef path = RCTPathCreateWithRoundedRect(self.bounds, cornerInsets, NULL);
+
+    CGContextAddPath(context, path);
+    CGContextFillPath(context);
+    CGPathRelease(path);
+  }
+}
+
+
+#pragma mark - Focus Events
+
+- (BOOL)needsPanelToBecomeKey 
+{
+	// We need to override this so that mouse clicks don't move keyboard focus on focusable views by default. 
+	return false;
+}
+
+- (BOOL)acceptsFirstResponder
+{
+  return _props->focusable || [super acceptsFirstResponder];
+}
+
+- (BOOL)becomeFirstResponder
+{
+  if (![super becomeFirstResponder]) {
+    return NO;
+  }
+  
+  if (_eventEmitter) {
+    _eventEmitter->onFocus();
+  }
+  
+  return YES;
+}
+
+-  (BOOL)resignFirstResponder
+{
+  if (![super resignFirstResponder]) {
+    return NO;
+  }
+  
+  if (_eventEmitter) {
+    _eventEmitter->onBlur();
+  }
+  
+  return YES;
+}
+  
+#endif // macOS]
+
 - (SharedTouchEventEmitter)touchEventEmitterAtPoint:(CGPoint)point
 {
   return _eventEmitter;