Add a `saxsscore` module.

[rvhonorato]

With it we can score chi2, Rg, or Dmax, and combine it with the haddock-score.

[rvhonorato]

Issue is already 3 months old, is this still being worked on @cvnoort or should we close it?

[amjjbonvin]

Still a relevant module to add.

[cvnoort]

It is being worked on @rvhonorato .

[github-actions]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 5 days.

[github-actions]

This issue was closed because it has been stalled for 5 days with no activity.

[amjjbonvin]

Still relevant and the module is almost done