fix(fabric): Add focus and blur to View commands (#2703)

## Summary:

Followup to #2692 , we need to add `focus` and `blur` to the View native
components' commands, and implement them so they can be called by JS.
This matches what is later implemented upstream in
facebook@3e58380

## Test Plan:

`ref.current?.focus()` actually works.

Author: Saadnajmi

packages/react-native/Libraries/Components/View/ViewNativeComponent.js

@@ -21,12 +21,14 @@ const ViewNativeComponent: HostComponent<Props> =
   }));
 
 interface NativeCommands {
+  +focus: () => void; // [macOS]
+  +blur: () => void; // [macOS]
   +hotspotUpdate: (viewRef: HostInstance, x: number, y: number) => void;
   +setPressed: (viewRef: HostInstance, pressed: boolean) => void;
 }
 
 export const Commands: NativeCommands = codegenNativeCommands<NativeCommands>({
-  supportedCommands: ['hotspotUpdate', 'setPressed'],
+  supportedCommands: ['focus', 'blur', 'hotspotUpdate', 'setPressed'], // [macOS]
 });
 
 export default ViewNativeComponent;

packages/react-native/Libraries/__tests__/__snapshots__/public-api-test.js.snap

@@ -4096,6 +4096,8 @@ export type AccessibilityProps = $ReadOnly<{
 exports[`public API should not change unintentionally Libraries/Components/View/ViewNativeComponent.js 1`] = `
 "declare const ViewNativeComponent: HostComponent<Props>;
 interface NativeCommands {
+  +focus: () => void;
+  +blur: () => void;
   +hotspotUpdate: (viewRef: HostInstance, x: number, y: number) => void;
   +setPressed: (viewRef: HostInstance, pressed: boolean) => void;
 }

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

@@ -1512,6 +1512,19 @@ - (BOOL)didActivateAccessibilityCustomAction:(UIAccessibilityCustomAction *)acti
 
 #if TARGET_OS_OSX // [macOS
 
+- (void)handleCommand:(const NSString *)commandName args:(const NSArray *)args
+{
+  if ([commandName isEqualToString:@"focus"]) {
+    [self focus];
+    return;
+  }
+
+  if ([commandName isEqualToString:@"blur"]) {
+    [self blur];
+    return;
+  }
+}
+
 # pragma mark - Focus Ring
 
 - (CGRect)focusRingMaskBounds
@@ -1537,6 +1550,16 @@ - (void)drawFocusRingMask
 
 
 #pragma mark - Focus Events
+  
+- (void)focus
+{
+  [[self window] makeFirstResponder:self];
+}
+
+- (void)blur
+{
+  [[self window] resignFirstResponder];
+}
 
 - (BOOL)needsPanelToBecomeKey 
 {