Draft: Update tvb-widgets

Summary

This can be merged once the functionality of the widgets is verified in the Lab-int.

Package	tvb-widgets
Version added
Contact point	@elmath, @teodoramisan
KG entry

Checks

• Software Quality Checklist: SQ-Checklist.pdf (level: )
• Current maintainer is listed first in package.py
• No pinned dependency versions
• Post-installation tests are defined