Return an item of the container uniformly at random using
the generator. Same as sample-element unless container is of type container-uses-nodes-mixin.
| sample-item < > < cl-variates:basic-random-number-generator > |
| sample-item < sequence > < cl-variates:basic-random-number-generator > |
| sample-item < t > < cl-variates:random-number-generation-mixin > |