Modular memberships (#659)

### Description

Switched association's membership from Enum to database table.
Changed reception route module accordingly

### Checklist

- [x] Created tests which fail without the change (if possible)
- [x] All tests passing
- [x] Extended the documentation, if necessary

Author: Rotheem

app/core/core_endpoints/models_core.py

@@ -1,27 +1,9 @@
 """Common model files for all core in order to avoid circular import due to bidirectional relationship"""
 
-from datetime import date
-
-from sqlalchemy import ForeignKey
 from sqlalchemy.orm import Mapped, mapped_column
 
 from app.core.groups.groups_type import AccountType
-from app.types.membership import AvailableAssociationMembership
-from app.types.sqlalchemy import Base, PrimaryKey
-
-
-class CoreAssociationMembership(Base):
-    __tablename__ = "core_association_membership"
-
-    id: Mapped[PrimaryKey]
-    user_id: Mapped[str] = mapped_column(
-        ForeignKey("core_user.id"),
-    )
-    membership: Mapped[AvailableAssociationMembership] = mapped_column(
-        index=True,
-    )
-    start_date: Mapped[date]
-    end_date: Mapped[date]
+from app.types.sqlalchemy import Base
 
 
 class CoreData(Base):

app/core/groups/groups_type.py

@@ -24,6 +24,7 @@ class GroupType(str, Enum):
     ph = "4ec5ae77-f955-4309-96a5-19cc3c8be71c"
     admin_cdr = "c1275229-46b2-4e53-a7c4-305513bb1a2a"
     eclair = "1f841bd9-00be-41a7-96e1-860a18a46105"
+    BDS = "61af3e52-7ef9-4608-823a-39d51e83d1db"
 
     # Auth related groups