No method for prepare_population_for_modelling for class of conmat_population

[MikeLydeamore]

I think when we added the class conmat_population, an error where there is no prepare population for modelling class for our object has appeared:

library(conmat)
prepare_population_for_modelling(get_polymod_population())
#> Error in UseMethod("prepare_population_for_modelling"): no applicable method for 'prepare_population_for_modelling' applied to an object of class "c('conmat_population', 'tbl_df', 'tbl', 'data.frame')"

^{Created on 2024-07-26 with reprex v2.0.2}

There is a conmat_population method (in get-age-population-function-internals.R, line 20) but it doesn't seem like it's being exported properly.