Add / Expand support for `gamlss` package

I’ve used your ‘performance’ package to examine LM and GLM models and it’s just superb.

I wonder if you reckon your package could be extended to include GAMLSS models (if you are unaware of these models, please check this review and this overview).

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This might be hard to do due to the huge number of supported families...

From example("gamlss"):

library(gamlss)

data(abdom)

mod <- gamlss(y ~ pb(x),
  sigma.fo =  ~ pb(x),
  family = BCT(),
  data = abdom
)

performance::check_model(mod)
#> Homogeneity of variance could not be computed. Cannot extract residual variance from objects of class 'gamlss'.
#> Error: `check_model()` not implemented for models of class `gamlss` yet.

I have very little experience with this package, but I recall that the vcov is a bit wonky...

Start with the supplied example("gamlss") and the performance::check_model(mod) entry point, using the reported gamlss errors as the current baseline. Review how the package handles model classes and variance extraction, then determine the supported GAMLSS families and validation needed; done means GAMLSS models are handled without the shown unimplemented and residual-variance errors.