adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/firestorm.yaml

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+# Firestorm - Arcanist Pyromancy ability
+# Massive AoE fire damage
+
+ability_id: "firestorm"
+name: "Firestorm"
+description: "Call down a storm of fire from the heavens, devastating all enemies"
+ability_type: "spell"
+base_power: 55
+damage_type: "fire"
+scaling_stat: "intelligence"
+scaling_factor: 0.6
+mana_cost: 45
+cooldown: 4
+is_aoe: true
+target_count: 0
+effects_applied:
+  - effect_id: "scorched"
+    name: "Scorched"
+    effect_type: "dot"
+    duration: 2
+    power: 12
+    stat_affected: null
+    stacks: 1
+    max_stacks: 3
+    source: "firestorm"