Changes to Map an audience

removed subschema #4 from the sources/items request property anyOf list

added subschema #4 subschema #5 subschema #6 subschema #7 subschema #8 subschema #9 subschema #10 to the sources/items request property anyOf list

added the required property canExpand to the response with the 200 status

added the required property groups/items/description to the response with the 200 status

added the required property groups/items/expand to the response with the 200 status

added the required property url to the response with the 200 status

endpoint added