Error in the conversations schema

[RobinPicard]

The schema conversations has a property called custom_attributes. This is an object with properties that vary from one record to the other. Right now, there are 2 properties of this object that have been added to it: "issue_type" and "type". Those are actually the examples provided in the Intercom API's documentation and are not properties we should expect to find

Instead, we should not provide any properties to custom_attributes and return a jsonb that the end user will be able to parse themselves.