Godot: "animation_finished" Missing From AnimatedSprite3D

[Kayomn]

Godot version:
3.2.2

OS/device including version:
Manjaro Linux x86_64
Kernel 5.4.44-1-MANJARO

Issue description:
There is no animation_finished signal for AnimatedSprite3D unlike AnimatedSprite.

As the other signal, frame_changed, is present I assume this is either intentional or an accidental omission as they don't share any relevant common ancestor in their inheritance hierarchy.

Steps to reproduce:

1. Open the editor.
2. Create an AnimatedSprite3D node.
3. Select it and navigate to its signals tab.

Minimal reproduction project:
I do not think one is necessary doesn't require any project setup, however if requested I can provide one.

[jiteshvm]

I am on this, will have a PR ready soon

[seltee]

I met the same problem with this and also with frame_changed not fired. Please, merge the fix provided.