### 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.
String get_default_action_map_resource_name();
	RID tracker_create(const String p_name);
	String tracker_get_name(RID p_tracker);
	void tracker_check_profile(RID p_tracker, XrSession p_session = XR_NULL_HANDLE);
	void tracker_free(RID p_tracker);
	RID action_set_create(const String p_name, const String p_localized_name, const int p_priority);
	String action_set_get_name(RID p_action_set);
	bool attach_action_sets(const Vector<RID> &p_action_sets);
	void action_set_free(RID p_action_set);
	RID action_create(RID p_action_set, const String p_name, const String p_localized_name, OpenXRAction::ActionType p_action_type, const Vector<RID> &p_trackers);
	String action_get_name(RID p_action);
	void action_free(RID p_action);
	RID interaction_profile_create(const String p_name);
	String interaction_profile_get_name(RID p_interaction_profile);
	void interaction_profile_clear_bindings(RID p_interaction_profile);
	bool interaction_profile_add_binding(RID p_interaction_profile, RID p_action, const String p_path);
	bool interaction_profile_suggest_bindings(RID p_interaction_profile);
	void interaction_profile_free(RID p_interaction_profile);
	bool sync_action_sets(const Vector<RID> p_active_sets);
	bool get_action_bool(RID p_action, RID p_tracker);
	float get_action_float(RID p_action, RID p_tracker);
	Vector2 get_action_vector2(RID p_action, RID p_tracker);
	XRPose::TrackingConfidence get_action_pose(RID p_action, RID p_tracker, Transform3D &r_transform, Vector3 &r_linear_velocity, Vector3 &r_angular_velocity);
	bool trigger_haptic_pulse(RID p_action, RID p_tracker, float p_frequency, float p_amplitude, XrDuration p_duration_ns);
	void register_composition_layer_provider(OpenXRCompositionLayerProvider *provider);
	void unregister_composition_layer_provider(OpenXRCompositionLayerProvider *provider);
	const XrEnvironmentBlendMode *get_supported_environment_blend_modes(uint32_t &count);
	bool is_environment_blend_mode_supported(XrEnvironmentBlendMode p_blend_mode) const;
	bool set_environment_blend_mode(XrEnvironmentBlendMode p_blend_mode);
	XrEnvironmentBlendMode get_environment_blend_mode() const { return environment_blend_mode; }