Support for `{lcmm}`

```r
library(lcmm)
data(data_lcmm)

out <- datawizard::data_read("https://github.com/easystats/circus/raw/refs/heads/main/data/lcmm.rda")

summary(out$m1_linear)
model_parameters(out$m1_linear)
model_parameters(out$m2_linear)
model_parameters(out$mx_linear)
```
