### 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);
	OPENXR_API_INIT_XR_FUNC_V(xrAcquireSwapchainImage);
	OPENXR_API_INIT_XR_FUNC_V(xrApplyHapticFeedback);
	OPENXR_API_INIT_XR_FUNC_V(xrAttachSessionActionSets);
	OPENXR_API_INIT_XR_FUNC_V(xrBeginFrame);
	OPENXR_API_INIT_XR_FUNC_V(xrBeginSession);
	OPENXR_API_INIT_XR_FUNC_V(xrCreateAction);
	OPENXR_API_INIT_XR_FUNC_V(xrCreateActionSet);
	OPENXR_API_INIT_XR_FUNC_V(xrCreateActionSpace);
	OPENXR_API_INIT_XR_FUNC_V(xrCreateReferenceSpace);
	OPENXR_API_INIT_XR_FUNC_V(xrCreateSession);
	OPENXR_API_INIT_XR_FUNC_V(xrCreateSwapchain);
	OPENXR_API_INIT_XR_FUNC_V(xrDestroyAction);
	OPENXR_API_INIT_XR_FUNC_V(xrDestroyActionSet);
	OPENXR_API_INIT_XR_FUNC_V(xrDestroyInstance);
	OPENXR_API_INIT_XR_FUNC_V(xrDestroySession);
	OPENXR_API_INIT_XR_FUNC_V(xrDestroySpace);
	OPENXR_API_INIT_XR_FUNC_V(xrDestroySwapchain);
	OPENXR_API_INIT_XR_FUNC_V(xrEndFrame);
	OPENXR_API_INIT_XR_FUNC_V(xrEndSession);
	OPENXR_API_INIT_XR_FUNC_V(xrEnumerateEnvironmentBlendModes);
	OPENXR_API_INIT_XR_FUNC_V(xrEnumerateReferenceSpaces);
	OPENXR_API_INIT_XR_FUNC_V(xrEnumerateSwapchainFormats);
	OPENXR_API_INIT_XR_FUNC_V(xrEnumerateViewConfigurations);
	OPENXR_API_INIT_XR_FUNC_V(xrEnumerateViewConfigurationViews);
	OPENXR_API_INIT_XR_FUNC_V(xrGetActionStateBoolean);