Changes to Start a provider portal invoice upload

added the new application/msword enum value to the request property content_type

added the new application/vnd.ms-excel enum value to the request property content_type

added the new application/vnd.openxmlformats-officedocument.spreadsheetml.sheet enum value to the request property content_type

added the new application/vnd.openxmlformats-officedocument.wordprocessingml.document enum value to the request property content_type

added the new text/csv enum value to the request property content_type

endpoint added