feature-8785:Implement dropdown with a number in custom forms (#8900)

Author: khangon

app/api/schema/custom_forms.py

@@ -62,3 +62,5 @@ class Meta:
         schema='EventSchemaPublic',
         type_='event',
     )
+    min = fields.Integer(allow_none=True, default=0)
+    max = fields.Integer(allow_none=True, default=10)

app/models/custom_form.py

@@ -178,6 +178,8 @@ class TYPE:
     is_complex = db.Column(db.Boolean, nullable=False, default=False)
     event_id = db.Column(db.Integer, db.ForeignKey('events.id', ondelete='CASCADE'))
     custom_form_options = db.relationship('CustomFormOptions', backref="custom_form")
+    min = db.Column(db.Integer, default=0, nullable=True)
+    max = db.Column(db.Integer, default=10, nullable=True)
 
     @property
     def identifier(self):