Feature request: support for sdmTMB

[jebyrnes]

sdmTMB is a really interesting package for spatiotemporal modeling using TMB as the underlying engine. Some modelbased functions already work, some do not. Would be great to have it incorporated! Especially if there was a smooth way to pull space and time in ultimately for the by statements. Note, it already works well with ggeffects and its vignettes use ggeffects in a few places.

[strengejacke]

insight::get_predicted() (and hence, modelbased::estimate_relation() or modelbased::estimate_link() etc.) should work. Maybe it's not supported by marginaleffects, and thus estimate_means() doesn't work.

I just saw that re_form and re_form_iid are always set to NA. Maybe it's better to allow different options here?