[Feature] Make columnAscendingIcon and columnDescendingIcon clickable

[itsnotmeman]

The columnAscendingIcon and columnDescendingIcon appear when clicking on a column header to sort the column. These icons are not clickable to change the sort direction. So for columns with very small widths, it becomes very hard to find space around these icons to still be able to click on the header.

Would be great if this could be fixed so that it is possible to also click on the icons or remove the icons.

Here a sample code to reproduce the problem when clicking on the ID column header more than once.

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:pluto_grid/pluto_grid.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'PlutoGrid Example',
      home: Scaffold(
        appBar: AppBar(title: const Text('PlutoGrid Example')),
        body: const SimplePlutoGrid(),
      ),
    );
  }
}

class SimplePlutoGrid extends StatelessWidget {
  const SimplePlutoGrid({super.key});

  @override
  Widget build(BuildContext context) {
    // Define the columns for the grid
    final List<PlutoColumn> columns = [
      PlutoColumn(
        title: 'ID',
        field: 'id',
        minWidth: 40,
        width: 40,
        enableContextMenu: false,
        enableDropToResize: false,
        type: PlutoColumnType.number(),
      ),
      PlutoColumn(
        title: 'Name',
        field: 'name',
        type: PlutoColumnType.text(),
      ),
      PlutoColumn(
        title: 'Age',
        field: 'age',
        type: PlutoColumnType.number(),
      ),
    ];

    // Define the rows for the grid
    final List<PlutoRow> rows = [
      PlutoRow(cells: {
        'id': PlutoCell(value: 1),
        'name': PlutoCell(value: 'Alice'),
        'age': PlutoCell(value: 25),
      }),
      PlutoRow(cells: {
        'id': PlutoCell(value: 2),
        'name': PlutoCell(value: 'Bob'),
        'age': PlutoCell(value: 30),
      }),
      PlutoRow(cells: {
        'id': PlutoCell(value: 3),
        'name': PlutoCell(value: 'Charlie'),
        'age': PlutoCell(value: 35),
      }),
    ];

    return PlutoGrid(
      columns: columns,
      rows: rows,
      onChanged: (event) {
        print('changed');
      },
      configuration: PlutoGridConfiguration(
        enableMoveHorizontalInEditing: true, // Allow horizontal navigation
        shortcut: PlutoGridShortcut(
          actions: {
            ...PlutoGridShortcut.defaultActions,
            LogicalKeySet(LogicalKeyboardKey.shift): CustomShiftKeyAction(),
          }
        )
      ),
    );
  }
}

// Override shift key action to enable to start
// typing in uppercase in a PlutoGrid cell.
class CustomShiftKeyAction extends PlutoGridShortcutAction {
  @override
  void execute({
    required PlutoKeyManagerEvent keyEvent,
    required PlutoGridStateManager stateManager,
  }) {
    stateManager.setEditing(true);
    print('Shift pressed');
  }
}