Add skill type enumeration and update skill management for throw skills

scripts/resources/skill_data.gd

@@ -1,9 +1,15 @@
 class_name SkillData
 extends Resource
 
+enum SkillType {
+	ATTACK,
+	THROW,
+	MISC,
+}
 @export var name: String = ""
 @export var description: String = ""
 @export var node: PackedScene
 @export var config: Dictionary = {}
 @export var cost: int = 0
-@export var icon: Texture2D
+@export var icon: Texture2D
+@export var type: SkillType = SkillType.ATTACK