### 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 (openxr_api) {
		openxr_api->end_frame();
	}
}
bool OpenXRInterface::is_passthrough_supported() {
	return passthrough_wrapper != nullptr && passthrough_wrapper->is_passthrough_supported();
}
bool OpenXRInterface::is_passthrough_enabled() {
	return passthrough_wrapper != nullptr && passthrough_wrapper->is_passthrough_enabled();
}
bool OpenXRInterface::start_passthrough() {
	return passthrough_wrapper != nullptr && passthrough_wrapper->start_passthrough();
}
void OpenXRInterface::stop_passthrough() {
	if (passthrough_wrapper) {
		passthrough_wrapper->stop_passthrough();
	}
}
Array OpenXRInterface::get_supported_environment_blend_modes() {