feat(animation): add custom animation support

[DavideBruner]

This PR aims to enhance the functionality of this amazing library by introducing support for custom animations. Previously, the library provided predefined animations for common player actions such as idle, walk, run, jump, etc. With this update, users can now define and trigger their own custom animations tailored to their specific game requirements.

Key Updates:

• AnimationSet: The AnimationSet type has been expanded to include support for custom actions. Users can now define custom animations alongside the existing predefined ones.
• setCustomAnimation: A new function, setCustomAnimation, has been implemented into the store, to allow users to trigger custom animations during gameplay.

Usage Example:

import { useGame } from "ecctrl";

const animationSet = {
  idle: "Idle",
  walk: "Walk",
  run: "Run",
  .....
  // Custom actions
  custom: {
    fly: "Fly"
  }
};

// ...
const setCustomAnimation = useGame((state) => state.setCustomAnimation);
// ...
setCustomAnimation("fly");

[ErdongChen-Andrew]

Thank you, @DavideBruner! This is a great feature to have! I will need to do more testing on this and might need to make some adjustments to your code. 👍

[DavideBruner]

Appreciate it @ErdongChen-Andrew I’d be more than happy to help with any additional testing or modifications needed. Just let me know how/if I can assist! Thank you!