[I] Placeholders in IN lists are not inferred [datafusion]

[via GitHub]

kczimm opened a new issue, #15863:
URL: https://github.com/apache/datafusion/issues/15863

   ### Describe the bug
   
   Placeholders datatypes in `IN` lists are not inferred:
   
   Example:
   ```sql
   SELECT * FROM employees WHERE department_id IN ($1, $2, $3);
   ```
   
   ### To Reproduce
   
   ```rust
   let column = col("department_id");
   let param_placeholders = vec![
       Expr::Placeholder(Placeholder {
           id: "$1".to_string(),
           data_type: None,
       }),
       Expr::Placeholder(Placeholder {
           id: "$2".to_string(),
           data_type: None,
       }),
       Expr::Placeholder(Placeholder {
           id: "$3".to_string(),
           data_type: None,
       }),
   ];
   let in_list = Expr::InList(InList {
       expr: Box::new(column),
       list: param_placeholders,
       negated: false,
   });
   
   let schema = Arc::new(Schema::new(vec![
       Field::new("name", DataType::Utf8, true),
       Field::new("department_id", DataType::Int32, true),
   ]));
   let df_schema = DFSchema::try_from(schema).unwrap();
   
   let (inferred_expr, contains_placeholder) =
       in_list.infer_placeholder_types(&df_schema).unwrap();
   ```
   
   `inferred_expr` has `Placeholder` with `data_type = None`.
   
   ### Expected behavior
   
   `Placeholder` should have `data_type = Int32`
   
   ### Additional context
   
   _No response_


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