Basic Screen Reader Functionality on Fabric

[chiaramooney]

Add support for key props to unblock basic screen reader navigation and announcements allowing a real AT user to “read” the UI.

Task	Description	Status
focusable	Add support for the focusable prop on Fabric. Elements should be focusable when prop is set to true and not focusable when prop is set to false. Behavior should change upon fast refresh.	#11674
accessible	Add support for the accessible prop on Fabric.	#11719
role / accessibilityRole	Add support for the role/accessibilityRole prop on Fabric	#11719 #11876

IRawElementProviderFragment::SetFocus | Add support for the accessibilityState prop on campus | #11674

### Tasks
- [ ] https://github.com/microsoft/react-native-windows/pull/11674
- [ ] https://github.com/microsoft/react-native-windows/pull/11719
- [ ] https://github.com/microsoft/react-native-windows/pull/11876

[chrisglein]

Looks like accessibilityState is the last remaining item on this list. @YajurG @chiaramooney can you split out a tracking issue for this so we can include in planning?