Adding string to parameters for replace function

[Bidek56]

Adding string to parameters for expr replace function
Adding replace tests

[universalmind303]

I think it'd be a bit more readable if we took in a object/map here instead of the array. (this could totally be done in a follow up pr though.

pl.col("a").replace({ 1: 11, 2: 12 }, 10, pl.Int64)
pl.col("b").replace({ a: "c", b: "d" }, "e", pl.Utf8)

also, i think using an object for the additional parameters would make things more readable

pl.col("a").replace({ 1: 11, 2: 12 }, {
  defaultValue: 10,
  returnType: pl.Int64,
})

[Bidek56]

It would be more readable but I want to test list as param.
Python version supports both list and dict, hence we need to support both and test for it.
We can add another test using object if you like.