### 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.
XrSystemGetInfo system_get_info = {
		XR_TYPE_SYSTEM_GET_INFO, 
		nullptr, 
		form_factor 
	};
	XrResult result = xrGetSystem(instance, &system_get_info, &system_id);
	if (XR_FAILED(result)) {
		print_line("OpenXR: Failed to get system for our form factor [", get_error_string(result), "]");
		return false;
	}
	
	void *next_pointer = nullptr;
	for (OpenXRExtensionWrapper *wrapper : registered_extension_wrappers) {
		void *np = wrapper->set_system_properties_and_get_next_pointer(next_pointer);
		if (np != nullptr) {
			next_pointer = np;
		}