adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/last_stand.yaml

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+# Last Stand - Oathkeeper Aegis of Light ultimate
+# Invulnerable + taunt all
+
+ability_id: "last_stand"
+name: "Last Stand"
+description: "Make your final stand, becoming invulnerable and forcing all enemies to attack you"
+ability_type: "skill"
+base_power: 0
+damage_type: null
+scaling_stat: "constitution"
+scaling_factor: 0.5
+mana_cost: 55
+cooldown: 8
+is_aoe: true
+target_count: 0
+effects_applied:
+  - effect_id: "invulnerable"
+    name: "Invulnerable"
+    effect_type: "buff"
+    duration: 3
+    power: 100
+    stat_affected: null
+    stacks: 1
+    max_stacks: 1
+    source: "last_stand"
+  - effect_id: "ultimate_taunt"
+    name: "Challenged"
+    effect_type: "debuff"
+    duration: 3
+    power: 100
+    stat_affected: null
+    stacks: 1
+    max_stacks: 1
+    source: "last_stand"