Add BCT metrics projection widget

[deeptive]

Adds a BCT metrics projection widget for interactive execution and visualization of Brain Connectivity ToolBox metrics on TVB Connectivity data.

[915-Misan-Teodora]

Maybe you could expose BCTMetricsProjectionWidget in tvbwidgets.api and import it from there here in the notebook, to stay consistent with the other widgets examples.

[liadomide]

The reverse order of imports should avoid the library issue:

from tvbwidgets.api import BCTMetricsProjectionWidget
from tvb.datatypes.connectivity import Connectivity

[liadomide]

As the default connectivity does not have the main diagonal 0, and this conflicts with some analyzers, could we add a step to make the diagonal zero at a user-action? Maybe a button in the widget, or a cell in the notebook ?

[liadomide]

I merged another PR recently in main
I suggest a rebase in this branch before merging the PR

[deeptive]

As the default connectivity does not have the main diagonal 0, and this conflicts with some analyzers, could we add a step to make the diagonal zero at a user-action? Maybe a button in the widget, or a cell in the notebook ?

Currently, the widget checks whether the connectivity matrix has non-zero diagonal entries (which conflict with all analyzers). If so, it displays a confirmation dialog asking the user whether to set the diagonal to zero, and only proceeds with the modification if the user confirms. Would this be considered the intended user-triggered step, or would you prefer a separate Zero Diagonal button instead?

[sonarqubecloud]

Quality Gate passed

Issues
53 New issues
0 Accepted issues

Measures
0 Security Hotspots
17.2% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[915-Misan-Teodora]

Dear @deeptive, the widget looks good!
I just have a few small suggestions before merging this:

• when running the analysis, all modified cells are printed. This list can become quite long, especially because it also includes the diagonal values that are set to 0. Maybe we could either remove the detailed list or just print the total number of modified cells
• I think a clear title and a short description at the top of the notebook explaining what the BCT metrics widget does would help users understand the purpose of the notebook before running the cells
• there are still a few old messages for loading the connectivity: 'Load your connectivity below, ...', 'Hit Load first to load the connectivity editor', you could update them to refer to the new edit connectivity button