Add a graph visualization

[c-dilks]

Is your feature request related to a problem? Please describe.
Using AIDASoft/podio#377 and following along with key4hep/EDM4hep#193

Describe the solution you'd like
A graph to show all datatypes, relations, and associations; this would be especially helpful for new users.

Describe alternatives you've considered
No graph, since the YAML file already tells everything.

[wdconinc]

Do we not have a graph in the doxygen output? But yes, this would be nice!

[simonge]

Has this been created? @wdconinc contribution to podio in March (AIDASoft/podio@8ce5945) certainly allowed but is a more up to date version than installed in eic_shell.

With a local install of podio, the output of:

./podio-vis /opt/software/linux-debian12-x86_64_v2/gcc-12.2.0/edm4eic-7.0.0-gyx3u4q7mg7tfrxbme5nyopq3do6qqgo/share/edm4eic/edm4eic.yaml --upstream-edm edm4hep:/opt/software/linux-debian12-x86_64_v2/gcc-12.2.0/edm4hep-0.10.5-mafwdcsoggwoizgbquwc5oxlujqfl5om/
share/edm4hep/edm4hep.yaml 

While the extension of the datamodel from edm4hep components gets plotted correctly it doesn't capture the relationships between the components it's extended from i.e. OneToOneRelations between SimHits and MCParticles.

There are certainly aesthetic improvements which could be made with a graph-conf file.

[wdconinc]

The PR above is in podio@1, but I am not sure if we are ready to upgrade from [email protected] to that yet. Let me see what is possible with some testing.