### 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.
if (!load_supported_view_configuration_views(view_configuration)) {
		destroy_instance();
		return false;
	}
	if (!load_supported_environmental_blend_modes()) {
		destroy_instance();
		return false;
	}
	return true;
}
bool OpenXRAPI::initialize_session() {
	if (!create_session()) {
		destroy_session();
		return false;
	}
	if (!load_supported_reference_spaces()) {
		destroy_session();
		return false;
	}
	if (!setup_spaces()) {
		destroy_session();
		return false;
	}
	if (!load_supported_swapchain_formats()) {
		destroy_session();
		return false;
	}
	return true;
}
void OpenXRAPI::finish() {