[Feature request]: gempyor simulate / inference refactoring to enable fitting initial conditions

[pearsonca]

Label

enhancement, gempyor, inference

Priority Label

high priority

Is your feature request related to a problem? Please describe.

Gempyor does not support inference of certain parameters, most notably initial conditions.

The approach to parameters needs to be more generalized, so that initial conditions aren't treated as a special (non-inferrable) kind of parameter.

Is your feature request related to a new application, scenario round, pathogen? Please describe.

No response

Describe the solution you'd like

Modify approach to simulation such that it looks like output = model.run(parameters, times) or similar.