### 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.
HAND_JOINT_NONE = 0,
		HAND_JOINT_ORIENTATION_VALID = 1,
		HAND_JOINT_ORIENTATION_TRACKED = 2,
		HAND_JOINT_POSITION_VALID = 4,
		HAND_JOINT_POSITION_TRACKED = 8,
		HAND_JOINT_LINEAR_VELOCITY_VALID = 16,
		HAND_JOINT_ANGULAR_VELOCITY_VALID = 32,
	};
	BitField<HandJointFlags> get_hand_joint_flags(Hand p_hand, HandJoints p_joint) const;
	Quaternion get_hand_joint_rotation(Hand p_hand, HandJoints p_joint) const;
	Vector3 get_hand_joint_position(Hand p_hand, HandJoints p_joint) const;
	float get_hand_joint_radius(Hand p_hand, HandJoints p_joint) const;
	Vector3 get_hand_joint_linear_velocity(Hand p_hand, HandJoints p_joint) const;
	Vector3 get_hand_joint_angular_velocity(Hand p_hand, HandJoints p_joint) const;
	OpenXRInterface();
	~OpenXRInterface();
};
VARIANT_ENUM_CAST(OpenXRInterface::Hand)
VARIANT_ENUM_CAST(OpenXRInterface::HandMotionRange)
VARIANT_ENUM_CAST(OpenXRInterface::HandJoints)
VARIANT_BITFIELD_CAST(OpenXRInterface::HandJointFlags)
#endif