[BUG] MAP metric reported in examples is not MAP@k

[anargyri]

Description

In benchmark_utils.py and in many of the Jupyter notebook examples, the MAP@k metric computed and reported comes from the recommenders.evaluation.python_evaluation.map() function rather than map_at_k().

Expected behavior (i.e. solution)

Replace instances of map() with map_at_k() wherever the MAP@k metric is reported.

Willingness to contribute

• Yes, I can contribute for this issue independently.
• Yes, I can contribute for this issue with guidance from Recommenders community.
• No, I cannot contribute at this time.

[anargyri]

Related issues #1702 #2004.

[miguelgfierro]

we should add all the notebooks with map_at_k instead of map https://github.com/recommenders-team/recommenders/blob/main/examples/00_quick_start/sar_movielens.ipynb

[miguelgfierro]

we also need to update the docstring: https://github.com/ds-wook/recommenders/blob/d6ca0652c78ceb9941aa525d10c3be3caf93ac84/recommenders/evaluation/python_evaluation.py#L745