Macro for combining outputs

[andrzejressel]

let output1: Output<String> = ???
let output2: Output<i32> = ???
output!{
   SomeObject {
      string_field: output1,
      int_field: output2,
   }
}

should be converted to

let output1: Output<String> = ???
let output2: Output<i32> = ???
Output::combine(output1, output2, |o1, o2| {
   SomeObject {
      string_field: o1,
      int_field: o2,
   }
}