What is the jaylib equivalent for texture.width ?

How does one access a texture's inner fields, for example `tex.width` and `tex.height` ?

```
(def img (load-image-1 "raylib.png"))
(def tex (load-texture-from-image img))
(unload-image img)

# This doesn't work
(def w (get tex :width))
(def h (get tex :height))
```