macro implementation of glm_max and glm_min

instead of the current glm_max and glm_imax function,, we could provide a single macro implementation which works for all types using c23 typeof, something like

```c
#define MAX(a, b) ({           \
    typeof(a) _a = (a);        \
    typeof(b) _b = (b);        \
    _a > _b ? _a : _b;         \
})
```

Just an idea, not sure if it's worth it