Feature request. Add some names to the graph nodes

[Phong13]

Thanks for this very handy tool.

It would be much more useful if the nodes had names.

Ideally Playables could have a GetName method.

Failing that, for many node types it should be possible to grab a reasonable name. For example, if the node is AnimationClipPlayable, then the name could be the name of the clip. For an AnimationControllerPlayable it could be the name of the Animation Controller asset.

[SolarianZ]

I added this function in my PlayableGraph Monitor：https://github.com/SolarianZ/UnityPlayableGraphMonitorTool#adding-extra-labels-to-playable-nodes