Tvb-widgets

A new feature has been added to the PhasePlaneWidget to allows users export a model configuration into JSON or PYTHON format.
Fix bug in TimeSeriesWidget to display channel values when SV/mode has been changed.

Fix bug of not including the `.css` file for `ipyreact` based widget.

**Release notes - EBRAINS2.0 - w2.0**
**Story**
[EBR-23](https://tvb-projects.atlassian.net/browse/EBR-23) Create a DICOM Widget

**Bug**
[EBR-29](https://tvb-projects.atlassian.net/browse/EBR-29) tvb-widgets not working in JupyterLab 4

[EBR-33](https://tvb-projects.atlassian.net/browse/EBR-33) upgrade ipywidgets lib in tvb-widgets

[EBR-34](https://tvb-projects.atlassian.net/browse/EBR-34) delay in showing changes in control features - 3D Connectivity Widget

[EBR-35](https://tvb-projects.atlassian.net/browse/EBR-35) Jupyter Lab crashes while running Connectivity notebook

**Task**
[EBR-16](https://tvb-projects.atlassian.net/browse/EBR-16) More options to visualize data

[EBR-19](https://tvb-projects.atlassian.net/browse/EBR-19) Release Connectivity widget with iPyReact

[EBR-24](https://tvb-projects.atlassian.net/browse/EBR-24) Mirror tvb-* relevant repos under EBRAINS 2.0 gitlab

**New Feature**
* [WID-223] - Connectivity Widget(s)

**Tasks**
* [WID-67] - Add coloring of TS channels
* [WID-215] - On MNE TSWidget add option to show PSD

**Bug Fixed**
* [WID-214] - MNE TS widget not working correctly in some cases

Release Notes - TVB Widgets for EBRAINS - Version 1.5.0


* [WID-221] - Connectivity parameter in PSEWidget
* [WID-226] - Videos from Collab wiki page not working in Firefox
* [WID-174] - Implement a new TS based on plotly
* [WID-208] - Stage-in parameters in HPC launch
* [WID-216] - Decide version for ipywidgets: 7.7.2 vs >=8.0.0
* [WID-217] - Adjust spacing and amplitude of signal in TS widget with plotly
* [WID-219] - Document plotly backend for the TS widget
* [WID-222] - Add backend selection option to TimeSeriesBrowser widget
* [WID-225] - Add unit tests for plotly backend of TS widget
* [WID-227] - Prepare for tvb-widgets 1.5.0 release