Changes to Create task

added the new optional request property body

added the new optional request property all_must_sign

added the new optional request property ez_sign_template_id

added the new optional request property verification_types

the request property name became optional

added the new contact_info_verification enum value to the request property task_type

added the new ez_sign enum value to the request property task_type

added the new optional request property amount_due

added the new optional request property task_type

added the non-success response with the status 422

added the new optional request property document_category_id

added the new optional request property due_date

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