Changes to Create Campaign Endpoint

the request property budget_max became optional

the request property budget_min became optional

request property budget_max list-of-types was widened by adding types null to media type application/json

request property budget_min list-of-types was widened by adding types null to media type application/json

added the optional property autopilot_enabled to the response with the 200 status

added the new optional request property knowledge_base

added the optional property knowledge_base to the response with the 200 status