### 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.
ERR_FAIL_COND_V(instance == XR_NULL_HANDLE, false);
	if (supported_view_configuration_types != nullptr) {
		
		memfree(supported_view_configuration_types);
		supported_view_configuration_types = nullptr;
	}
	XrResult result = xrEnumerateViewConfigurations(instance, system_id, 0, &num_view_configuration_types, nullptr);
	if (XR_FAILED(result)) {
		print_line("OpenXR: Failed to get view configuration count [", get_error_string(result), "]");
		return false;
	}
	supported_view_configuration_types = (XrViewConfigurationType *)memalloc(sizeof(XrViewConfigurationType) * num_view_configuration_types);
	ERR_FAIL_NULL_V(supported_view_configuration_types, false);
	result = xrEnumerateViewConfigurations(instance, system_id, num_view_configuration_types, &num_view_configuration_types, supported_view_configuration_types);
	ERR_FAIL_COND_V_MSG(XR_FAILED(result), false, "OpenXR: Failed to enumerateview configurations");
	ERR_FAIL_COND_V_MSG(num_view_configuration_types == 0, false, "OpenXR: Failed to enumerateview configurations"); 
	for (uint32_t i = 0; i < num_view_configuration_types; i++) {
		print_verbose(String("OpenXR: Found supported view configuration ") + OpenXRUtil::get_view_configuration_name(supported_view_configuration_types[i]));
	}
	
	if (!is_view_configuration_supported(view_configuration)) {
		print_verbose(String("OpenXR: ") + OpenXRUtil::get_view_configuration_name(view_configuration) + String(" isn't supported, defaulting to ") + OpenXRUtil::get_view_configuration_name(supported_view_configuration_types[0]));
		view_configuration = supported_view_configuration_types[0];
	}
	return true;
}
bool OpenXRAPI::load_supported_environmental_blend_modes() {