NetworkAnimator requires Animator Component to be present on GO, but also user has to manually add the Animator component to NetworkAnimator.
Regarding that there’s no option to add second Animator to object, this action looks a bit redundant and inconsistent
(e.g. with NetworkTransfrom, we don’t manually show which transform it needs to refer to).

To reproduce:
1. Create new GameObject.
2. Add NetworkAnimator component.
Note: Animator and NetworkIdentity components are auto-added.

Actual result: You're required to manually add Animator component reference to NetworkAnimator.

4. Optionally remove reference to Animator from NetworkAnimator:
Actual result:
```ResetParameterOptions
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)```

Expected result: Animator should be automatically linked to NetworkAnimator with no need to be explicitly added.