sigma_clip mutates original array like sigma_clip!

[m4ttes4]

The sigma_clip function modifies the original array, which it should not do. The mutating behavior should be reserved for the sigma_clip! function, while sigma_clip should return a new array without altering the original one.

Here is an example following the one presented in the documentation:

julia> x = randn(100_000);

julia> extrema(x)
(-4.319272752707137, 4.141796263661749)

julia> x_clip = sigma_clip(x, 1);

julia> extrema(x_clip)
(-1.00008381672931, 0.9976227973860834)

julia> extrema(x) # It should be like the original, but it's not
(-1.00008381672931, 0.9976227973860834)

Expected Behavior:

The sigma_clip function should return a new array without modifying x.
Only sigma_clip! should modify the original array.

Environment:
Julia Version: 1.11.1 (but also 1.10...)
Package Version: latest