Add "show" support to DataFrame API

[alamb]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
While developing projects with datafusion, often times it is useful to preview the output.

Right now it is somewhat awkward to print the results of a DataFrame to stdout as it requires something like the following from the examples

    let df = ctx
        .read_parquet(filename)?
        .select_columns(&["id", "bool_col", "timestamp_col"])?
        .filter(col("id").gt(lit(1)))?;

    let results = df.collect().await?;
    pretty::print_batches(&results)?;

Describe the solution you'd like
it would be nice to allow a user to simply call a show function

    let df = ctx
        .read_parquet(filename)?
        .select_columns(&["id", "bool_col", "timestamp_col"])?
        .filter(col("id").gt(lit(1)))?;

    df.show().await;

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.

[francis-du]

I will open an issue by myself next time, thanks for your job.