feat(trigger): refactor trigger provider to subscription model

- Rename classes and methods to reflect the transition from credentials to subscriptions
- Update API endpoints for managing trigger subscriptions
- Modify data models and entities to support subscription attributes
- Enhance service methods for listing, adding, updating, and deleting subscriptions
- Adjust encryption utilities to handle subscription data

Co-authored-by: Claude <noreply@anthropic.com>

api/core/trigger/entities/entities.py

@@ -99,6 +99,7 @@ class OAuthSchema(BaseModel):
         default_factory=list, description="The schema of the OAuth credentials"
     )
 
+
 class SubscriptionSchema(BaseModel):
     """
     The subscription schema of the trigger provider
@@ -114,6 +115,7 @@ class SubscriptionSchema(BaseModel):
         description="The configuration schema stored in the subscription entity",
     )
 
+
 class TriggerProviderEntity(BaseModel):
     """
     The configuration of a trigger provider