Use map_from_arrays() for map construction in rustler_codegen

[evnu]

As noted in #440, we should try to use map_from_arrays() when constructing maps in rustler_codegen. As pointed out by @SeokminHong, changing the signature of map_from_arrays() to use impl Encoder instead of Term<'a> could simplify that:

    pub fn map_from_arrays(
        env: Env<'a>,
        keys: &[impl Encoder],
        values: &[impl Encoder],
    ) -> NifResult<Term<'a>> {

[hansihe]

As long as we use impl Encoder + 'a I believe this should be a non-breaking change?

[philss]

Can we use map_from_pairs/2 instead? Anyway, the same change may apply to that function.