Add evidently example

[francesco086]

Contributes to #699, and as suggested in iterative/dvc.org#4918

[francesco086]

There is one issue with codespell, but by inspection I really don't get where it comes from. Is there a way to exclude that line for that file?

Also, I noticed that there is an issue with the pre-existing examples/DVCLive-HuggingFace.ipynb

codespell................................................................Failed
- hook id: codespell
- exit code: 65

examples/DVCLive-HuggingFace.ipynb:69: traning ==> training
examples/DVCLive-Evidently.ipynb:918: te ==> the, be, we, to
examples/DVCLive-Evidently.ipynb:918: nd ==> and, 2nd

Any hint?

[dberenbaum]

Thanks @francesco086! LGTM!