Add skill management system with unlocker and save functionality

resources/skills/magnetic.tres

@@ -0,0 +1,16 @@
+[gd_resource type="Resource" script_class="SkillData" load_steps=3 format=3 uid="uid://d3bjre2etov1n"]
+
+[ext_resource type="PackedScene" uid="uid://cunyndudjh2he" path="res://objects/player_skills/magnetic_skill.tscn" id="1_er41s"]
+[ext_resource type="Script" path="res://scripts/resources/skill_data.gd" id="1_r01oq"]
+
+[resource]
+script = ExtResource("1_r01oq")
+name = "Magnetic"
+description = "Attract coins"
+node = ExtResource("1_er41s")
+config = {
+"magnetic_area": NodePath("MagneticArea"),
+"magnetic_move_duration": 1.25,
+"root": NodePath(".")
+}
+cost = 70