feat(telegram_bot): added states folder

solution/services/telegram_bot/states/campaign.py

@@ -0,0 +1,16 @@
+from aiogram.fsm.state import State, StatesGroup
+
+
+class CampaignState(StatesGroup):
+    ad_title = State()
+    ad_text = State()
+    impressions_limit = State()
+    clicks_limit = State()
+    cost_per_impression = State()
+    cost_per_click = State()
+    start_date = State()
+    end_date = State()
+    gender = State()
+    age_from = State()
+    age_to = State()
+    location = State()