ENH: Add generate auth token

[mferrera]

Resolves #1

Adds a generate token function to pass an authentication token to the API/GUI threads. It also passes it to the React app as URL fragment. Although our security concerns are less severe given we are executing on TGX nodes where users are already authenticated, this adds some additional protection against someone using the same node and navigating to localhost:8000 and hijacking a session. It will also disallow un-authenticated post requests to the API.

Additional this adds some extra tests which were not added when the repository was initialized.

Checklist

• Tests added (if not, comment why)
• Test coverage equal or up from main (run pytest with --cov=<packagename> --cov-report term-missing)
• If not squash merging, every commit passes tests
• Appropriate commit prefix and precise commit message used
• All debug prints and unnecessary comments removed
• Docstrings are correct and updated
• Documentation is updated, if necessary
• Latest main rebased/merged into branch
• Added comments on this PR where appropriate to help reviewers
• Moved issue status on project board
• Checked the boxes in this checklist ✅

[mferrera]

It's not used yet. This has to be added in the API-exported run_server next.

[slangeveld]

Nice 👍

[joargr]

Looks good.