adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/ice_shard.yaml

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+# Ice Shard - Arcanist Cryomancy ability
+# Single target ice damage with slow
+
+ability_id: "ice_shard"
+name: "Ice Shard"
+description: "Hurl a shard of ice at your enemy, dealing frost damage and slowing them"
+ability_type: "spell"
+base_power: 20
+damage_type: "ice"
+scaling_stat: "intelligence"
+scaling_factor: 0.5
+mana_cost: 10
+cooldown: 0
+is_aoe: false
+target_count: 1
+effects_applied:
+  - effect_id: "chilled"
+    name: "Chilled"
+    effect_type: "debuff"
+    duration: 2
+    power: 20
+    stat_affected: null
+    stacks: 1
+    max_stacks: 3
+    source: "ice_shard"