Incorrect method signature for `arraylike`

```julia-repl
julia> StructUtils.arraylike([1])
false
```

This line
https://github.com/JuliaServices/StructUtils.jl/blob/main/src/StructUtils.jl#L220

should be:

```julia
arraylike(@nospecialize(::Type)) = false
arraylike(@nospecialize(x)) = arraylike(typeof(x))
```

I can make a PR soon, just wanted to write this down :)