[Collections\extend] Consider renaming?

[github-actions[bot]]

[Collections\extend] Consider renaming? we could actually rename it to merge? - which is what it does actually, and keep extend for extending existing types

https://github.com/arturo-lang/arturo/blob/4bed4542b3306aaeb55fe7d11f5193b2f90c3fef/src/library/Collections.nim#L573

                else: discard

    # TODO(Collections\extend) Consider renaming?
    #  we could actually rename it to `merge`? - which is what it does
    #  actually, and keep `extend` for extending existing types
    #  labels: library, enhancement, open discussion
    builtin "extend",
        alias       = unaliased,
        op          = opNop,

fac74c6c646a708dcd2b332688653d5e712c4263