Add methods for glm()

[juliasilge]

Right now a glm() model inherits from the lm() butchering methods, but there are still some things leftover like residuals:

library(butcher)

more_cars <- mtcars[rep(1:32, each = 1000),]
mod <- glm(mpg ~ ., data = more_cars, model = TRUE, x = TRUE)
butchered <- butcher(mod)

sum(weigh(mod)$size)
#> [1] 33.68289
sum(weigh(butchered)$size)
#> [1] 30.88575

^{Created on 2022-02-08 by the reprex package (v2.0.1)}

[juliasilge]

Here are some environments that need to be stripped out:

`environment(actual$model$family$variance)` is <env:0x145546700>
`environment(expected$model$family$variance)` is <env:0x135739b28>

`environment(actual$model$family$dev.resids)` is <env:0x145546700>
`environment(expected$model$family$dev.resids)` is <env:0x135739b28>

`environment(actual$model$family$aic)` is <env:0x145546700>
`environment(expected$model$family$aic)` is <env:0x135739b28>

`environment(actual$model$family$validmu)` is <env:0x145546700>
`environment(expected$model$family$validmu)` is <env:0x135739b28>

[github-actions]

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