### 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.
ClassDB::bind_method(D_METHOD("set_action_set_active", "name", "active"), &OpenXRInterface::set_action_set_active);
	ClassDB::bind_method(D_METHOD("get_action_sets"), &OpenXRInterface::get_action_sets);
	
	ClassDB::bind_method(D_METHOD("get_available_display_refresh_rates"), &OpenXRInterface::get_available_display_refresh_rates);
	
	ClassDB::bind_method(D_METHOD("set_motion_range", "hand", "motion_range"), &OpenXRInterface::set_motion_range);
	ClassDB::bind_method(D_METHOD("get_motion_range", "hand"), &OpenXRInterface::get_motion_range);
	ClassDB::bind_method(D_METHOD("get_hand_joint_flags", "hand", "joint"), &OpenXRInterface::get_hand_joint_flags);
	ClassDB::bind_method(D_METHOD("get_hand_joint_rotation", "hand", "joint"), &OpenXRInterface::get_hand_joint_rotation);
	ClassDB::bind_method(D_METHOD("get_hand_joint_position", "hand", "joint"), &OpenXRInterface::get_hand_joint_position);
	ClassDB::bind_method(D_METHOD("get_hand_joint_radius", "hand", "joint"), &OpenXRInterface::get_hand_joint_radius);
	ClassDB::bind_method(D_METHOD("get_hand_joint_linear_velocity", "hand", "joint"), &OpenXRInterface::get_hand_joint_linear_velocity);
	ClassDB::bind_method(D_METHOD("get_hand_joint_angular_velocity", "hand", "joint"), &OpenXRInterface::get_hand_joint_angular_velocity);
	ClassDB::bind_method(D_METHOD("is_hand_tracking_supported"), &OpenXRInterface::is_hand_tracking_supported);
	ClassDB::bind_method(D_METHOD("is_eye_gaze_interaction_supported"), &OpenXRInterface::is_eye_gaze_interaction_supported);
	BIND_ENUM_CONSTANT(HAND_LEFT);
	BIND_ENUM_CONSTANT(HAND_RIGHT);
	BIND_ENUM_CONSTANT(HAND_MAX);
	BIND_ENUM_CONSTANT(HAND_MOTION_RANGE_UNOBSTRUCTED);
	BIND_ENUM_CONSTANT(HAND_MOTION_RANGE_CONFORM_TO_CONTROLLER);
	BIND_ENUM_CONSTANT(HAND_MOTION_RANGE_MAX);
	BIND_ENUM_CONSTANT(HAND_JOINT_PALM);
	BIND_ENUM_CONSTANT(HAND_JOINT_WRIST);
	BIND_ENUM_CONSTANT(HAND_JOINT_THUMB_METACARPAL);
	BIND_ENUM_CONSTANT(HAND_JOINT_THUMB_PROXIMAL);
	BIND_ENUM_CONSTANT(HAND_JOINT_THUMB_DISTAL);
	BIND_ENUM_CONSTANT(HAND_JOINT_THUMB_TIP);
	BIND_ENUM_CONSTANT(HAND_JOINT_INDEX_METACARPAL);
	BIND_ENUM_CONSTANT(HAND_JOINT_INDEX_PROXIMAL);
	BIND_ENUM_CONSTANT(HAND_JOINT_INDEX_INTERMEDIATE);