Functions for assigned-sample endpoints

[dynata-bradley]

http://petstore.swagger.io/?url=https://kaleidoscope-survey-api.cmix.com/swagger.json#/

• GET
  ​/projects​/{projectId}​/email-campaigns​/{emailCampaignId}​/sends​/{sendId}​/assigned-sample
  Get Sample Lists assigned to the Email Campaign send
• POST
  ​/projects​/{projectId}​/email-campaigns​/{emailCampaignId}​/sends​/{sendId}​/assigned-sample
  Assign Sample List to Email Campaign send
• DELETE
  ​/projects​/{projectId}​/email-campaigns​/{emailCampaignId}​/sends​/{sendId}​/assigned-sample​/{assignedSampleListId}
  Unassign Sample List to Email Campaign send