Decouple Animator from PlayerMovementController

[ErikOverflow]

Is your feature request related to a problem? Please describe.
Yes, if you would like to migrate the movement controller to a new project, you would also need to migrate the animator and its parameters as well. The player's movement should be agnostic of the animation, especially knowing that we may implement the DragonBones or Spine runtimes, or Unity's 2D Animation package.

Describe the solution you'd like
Create a generic PlayerMovementController class with virtual methods for Jump() and RunDirection(Vector2 dir) that can be based and overridden to trigger specific animator implementations.

Describe alternatives you've considered
Expose subscribable events that a second script can listen to and trigger animator actions from.