Support column reference as percentile arg for `percentile_cont` and `approx_percentile_cont`

### Is your feature request related to a problem or challenge?

`percentile_cont` and `approx_percentile_cont` only accept a literal for the percentile argument (see [here](https://github.com/apache/datafusion/blob/main/datafusion/functions-aggregate/src/utils.rs#L44)).

We could extend support for column reference or projections as well.

### Describe the solution you'd like

Add support for `ColumnarValue::Array` for both `percentile_cont` and `approx_percentile_cont`.

### Describe alternatives you've considered

_No response_

### Additional context

_No response_