### Godot version

4.2.dev 80de898d721f952dac0b102d48bb73d6b02ee1e8

### System information

OpenXR

### Issue description

The Godot 3 OpenXR plugin supported obtaining boundary/guardian information in order to obtain play space logic. While we do have a function in the `XRInterface` in Godot 4 that is supposed to retrieve this information (`get_play_area`) it is not implemented on the Godot 4 `OpenXRInterface`.

This logic needs to be ported.

### Steps to reproduce

Call `get_play_area`, be amazed by it not returning data :P

### Minimal reproduction project

Any XR project.
RID action_set_rid; 
		String name; 
		XrActionType action_type; 
		Vector<ActionTracker> trackers; 
		XrAction handle; 
	};
	RID_Owner<Action, true> action_owner;
	RID get_action_rid(XrAction p_action);
	struct InteractionProfile { 
		String name; 
		XrPath path; 
		Vector<XrActionSuggestedBinding> bindings; 
	};
	RID_Owner<InteractionProfile, true> interaction_profile_owner;
	RID get_interaction_profile_rid(XrPath p_path);
	XrPath get_interaction_profile_path(RID p_interaction_profile);
	
	bool poll_events();
	bool on_state_idle();
	bool on_state_ready();
	bool on_state_synchronized();
	bool on_state_visible();
	bool on_state_focused();
	bool on_state_stopping();
	bool on_state_loss_pending();
	bool on_state_exiting();
	
	void copy_string_to_char_buffer(const String p_string, char *p_buffer, int p_buffer_len);
public:
	XrInstance get_instance() const { return instance; };