Get the tree prior names
See also
Use create_tree_priors to get all tree priors
Examples
check_empty_beautier_folder()
get_tree_prior_names()
#> [1] "birth_death" "coalescent_bayesian_skyline"
#> [3] "coalescent_constant_population" "coalescent_exp_population"
#> [5] "yule"
check_empty_beautier_folder()