import-debian-package should handle special characters

Background

The tool import-debian-package needs to handle special characters like +, since those characters are not allowed by Gitlab and are trimmed during the import, causing confusions and potentially match a different package.

As an example, in pkg/socketxx!1 (merged) it was noticed that the initial import of socket++ generated the repo socket.

Reproducibility

How often the issue is hit when repeating the steps to reproduce and changing nothing?

Put the ✅ in the most appropriate entry:

1. ✅ always
2. often, but not always
3. rarely

Impact of bug

This bug causes confusion when the package name contains special characters.

Outcomes

TBD

Management data

This section is for management only, it should be the last one in the description.

/cc @em @balasubramanian @sudarshan @wlozano

Phabricator link: https://phabricator.apertis.org/T10978