Source simulation database

[CFGrote]

Develop a database for storing, archiving, and retrieving pre-computed intensity distributions (for raytracing) and complex wavefields (for wavefront propagation).

• Consider XFEL XPD (https://in.xfel.eu/xpd) as a example/prototype
  • can we extend it to host more sources and allow deposition from users
• Consider zenodo as a data repository where to store and query versioned datasets.
• Decide on data format (openpmd?) -> converters. re-use solutions from #5, #8
• Develop frontend(s) (web-based, console based, python based)