I have a dataset ds with 3 columns named A, B, C. Columns A and B have repeated values. How can I obtain another dataset that contains a list of the values in C for each of the unique combinations of A and B?

For example,

ds = Dataset[
    {<| "A" -> 2, "B" -> 3, "C" -> 100 |>,
     <| "A" -> 2, "B" -> 4, "C" -> 200 |>,
     <| "A" -> 2, "B" -> 3, "C" -> 300 |>}]

I want to get

Dataset[
 {<| "A" -> 2, "B" -> 3, "Clist" -> {100, 300} |>,
  <| "A" -> 2, "B" -> 4, "Clist" -> {200} |>}]

How can I do that?