shell: refactor table data output method

[acelyc111]

 A tool used to print data in a table form.

 Example usage 1:
    table_printer tp;
    tp.add_title("table_title");
    tp.add_column("column_name1");
    tp.add_column("column_name2");
    for (...) {
        tp.add_row("row_name_i");
        tp.append_data(int_data);
        tp.append_data(double_data);
    }

    std::ostream out(...);
    tp.output(out);

 Output looks like:
    table_title  column_name1  column_name2
    row_name_1   123           45.67
    row_name_2   456           45.68

 Example usage 2:
    table_printer tp;
    tp.add_row_name_and_data("row_name_1", int_value);
    tp.add_row_name_and_data("row_name_2", string_value);

    std::ostream out(...);
    tp.output(out, ": ");

 Output looks like:
    row_name_1 :  4567
    row_name_2 :  hello