Animation graph v1

[florenceCloutier]

Summary

Describe the structure of the animation graph and add some logic.

Current State

Currently, ready for review.

Work Items

• [x] Add structure of the anim graph in legion based on the graph in KRG engine
• [x] Add support for different nodes (state machine node, animation clip node, etc.)
• [x] Add logic to the anim graph (transitions between nodes (edges) and conditions for transitions)
• [x] Integrate use of animation skeleton in the graph