How to forward `effective_focal_length` to the analysis pipelines.

[GernotMaier]

effective_focal_length is currently in the list of simulation model parameters. This is not entirely correct, as it is an outcome of detailed ray tracing and not a model parameter (it is nowhere used for the simulations). The reconstruction pipeline requires effective_focal_length as input.

Discuss how this type of information should be forwarded to DataPipe.

(transferred from gitlab