feat(behaviour): add interactable (#22)

plugin/src/objects/behaviours/Interactable.cs

@@ -0,0 +1,41 @@
+using System;
+using PiUtils.Util;
+using UnityEngine;
+
+namespace PiUtils.Objects.Behaviours;
+
+public class Interactable : MonoBehaviour
+{
+	private static PluginLogger Logger = PluginLogger.GetLogger<Interactable>();
+
+	public Transform interactionTransform;
+	public float radius = 0.1f;
+	public event Action OnEnter;
+	public event Action OnExit;
+
+	public bool isHovered { get; private set; } = false;
+
+	private void Update()
+	{
+		if (interactionTransform == null)
+		{
+			return;
+		}
+
+		float distance = Vector3.Distance(interactionTransform.position, transform.position);
+		if (distance <= radius && !isHovered)
+		{
+			Logger.LogDebug($"Hovered {gameObject.name}");
+			isHovered = true;
+			OnEnter?.Invoke();
+			return;
+		}
+
+		if (distance > radius && isHovered)
+		{
+			Logger.LogDebug($"Unhovered {gameObject.name}");
+			isHovered = false;
+			OnExit?.Invoke();
+		}
+	}
+}