Refactor deeprank2.tools.target.add_targets function

[gcroci2]

Right now, in order to add a target Dataset to a HDF5 Group representing a ppi data point, the process is unnecessarily tedious. The user needs to create a file containing the IDs of the data points as they are in the HDF5 file + the new target values to be added.

We can think about improving its logic by taking as example the code I wrote for the 3D-Vac application. We need to save somewhere the query IDs of the processed data points (e.g., csv), so that than is going to be easier to associate the new targets to the IDs and to the HDF5 files Groups.

I think it's worth it to implement this when we'll have the data for the docking application. TBD exactly when

[github-actions]

This issue is stale because it has been open for 30 days with no activity.