Prepare the repo for open-sourcing

[claudio-tw]

Context

This PR contains a few changes in preparation of open sourcing hisel.

• The version of the package has been bumped to 0.5.0
• Files using torch have been removed, in preparation to the usage of CuPy

Checklist

• [x] Change meets or does not compromise the Baseline Security Requirements

[wise-github-bot-app[bot]]

Your CODEOWNERS or the tw-rules.yaml file has changed. Syncing your GitHub teams with your CODEOWNERS file and extraWriters in tw-rules:

Collaborator Name	Synced	Comment
customer-understanding-data-science	:green_circle:	Team updated with role owner
analysts-product	:green_circle:	Team was already up to date

You have more info in the docs