feat: add subscription and transaction repositories

- Implemented SubscriptionRepository with methods to get, create, and update subscriptions.
- Added BalanceTXRepository for creating and retrieving balance transactions.
- Introduced a test script for simulating Pally webhook for local testing.

schemas/subscriptions.py

@@ -1,4 +1,4 @@
-from enum import Enum
+from enum import Enum, StrEnum
 
 from pydantic import BaseModel
 
@@ -17,3 +17,13 @@ class SubscriptionPlan(BaseModel):
     duration: SubscriptionDuration = SubscriptionDuration.MONTH
     whitelists: bool = False
     discount: float = 1
+
+
+class SubscriptionStatus(StrEnum):
+    EXPIRED = "expired"
+    ACTIVE = "active"
+
+
+class InternalSquads(StrEnum):
+    WHITELISTS = settings.whitelist_squad
+    DEFAULT = settings.general_squad