### 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.
reference_space, 
			identityPose 
		};
		result = xrCreateReferenceSpace(session, &play_space_create_info, &play_space);
		if (XR_FAILED(result)) {
			print_line("OpenXR: Failed to create play space [", get_error_string(result), "]");
			return false;
		}
	}
	
	{
		if (!is_reference_space_supported(XR_REFERENCE_SPACE_TYPE_VIEW)) {
			print_line("OpenXR: reference space XR_REFERENCE_SPACE_TYPE_VIEW is not supported.");
			return false;
		}
		XrReferenceSpaceCreateInfo view_space_create_info = {
			XR_TYPE_REFERENCE_SPACE_CREATE_INFO, 
			nullptr, 
			XR_REFERENCE_SPACE_TYPE_VIEW, 
			identityPose 
		};
		result = xrCreateReferenceSpace(session, &view_space_create_info, &view_space);
		if (XR_FAILED(result)) {
			print_line("OpenXR: Failed to create view space [", get_error_string(result), "]");
			return false;
		}
	}
	return true;
}
bool OpenXRAPI::load_supported_swapchain_formats() {