Do we need functionality to pass arguments from epidist to all or some low level functions

[seabbs]

Raised in #474 it might be useful to pass batches of parameters in epidist to lower level functions vs having to have specific arguments. This is because if we need to keep adding features it could soon have a very overwhelming number of options.

[athowes]

Are there examples of lower level functions which you think would benefit from this already?

[seabbs]

epidist_prior