Connect learner textmodel_nb from package quanteda.textmodels

[andreassot10]

Before making this request, make sure that

1. The learner is not maintained in a third party repository (listed in the Table of all additional Learners), and
2. There is no other open or closed issue on this learner in this tracker.

Checklist before requesting a review

• Run styler::style_pkg(style = styler::mlr_style) (install pat-s/styler@mlr-style if not yet done)

• Run lintr::lint_package() and fix all issues.

• Run usethis::use_tidy_description() to format the DESCRIPTION file.

• Check that the learner package name is all lower case, e.g. mlr3learners.partykit.

• Ensure that there are not leftover of <package>, <algorithm> or <type> within the learner repo.

• Ensure that the "Parameter Check" passed in the CI (both for the train and predict functions)

• Ensure that "R CMD check" passed in the CI.

• Check that your learners upstream package is not listed in the "Imports" but in the "Suggests" section within the DESCRIPTION file.

• If you changed any parameter defaults: Did you document the change (reason and new default) in the help page of the respective learner?

• Open a Pull Request in the mlr3learners repo to add your learner to the list of "In Progress" learners. Once approved, it will be moved to the "Approved" section.