FixedExtentScrollController should be usable with a ListView having itemExtent specified

[fischerscode]

Use case

Whenever itemExtent is used in a ListView, it would be nice to control the scrolling using the item index instead of an offset.

Use case:
An app has a list of items and the list should be scrolled to the 5th item.

Proposal

Allow FixedExtentScrollController (or a controller with similar functionality specialized for lists, e.g. FixedExtentListScrollController) to be used with a ListView having itemExtent specified.

Currently FixedExtentScrollController can only be used with ListWheelScrollViews is thrown.

import 'package:flutter/material.dart';

final scrollController = FixedExtentScrollController();

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData.dark(),
      home: Scaffold(
        body: ListView.builder(
            controller: scrollController, // this line does not work
            itemExtent: 20,
            itemBuilder: (context, index) =>
                Center(child: Text(index.toString()))),
      ),
    );
  }
}

In case #113431 gets implemented, itemExtentPerIndex should also allow using a FixedExtentScrollController.
Apparently I'm not the only one needing this: #25074 (comment)

[fischerscode]

Sorry for the noise, just found #28012.

[github-actions]

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