Add Support for twoCellAnchor Object Positioning for Drawing

[sgarwood]

This is:

- [ ] a bug report
- [x] a feature request
- [x] **not** a usage question (ask them on https://stackoverflow.com/questions/tagged/phpspreadsheet or https://gitter.im/PHPOffice/PhpSpreadsheet)

What is the expected behaviour?

When creating an image in Excel there is the option to use 2 cell anchoring or 1 cell anchoring.

This allows users in Excel to scale the image with the cell in a more robust manner and makes
editing the spreadsheet manually after export less cumbersome.

OpenXML specificaion
http://officeopenxml.com/drwPicInSpread-twoCell.php

Example of desired behaviour

$drawing->setName('Paid');
$drawing->setDescription('Paid');
$drawing->setPath('./images/paid.png');

// New features below

$drawing->setTopRightCell('B15'); // alias to $drawing->setCoordinates('B15');
$drawing->setBottomRightCell('D20');

$drawing->editAs('oneCell'); // possible values are, oneCell, twoCell or absolute
$drawing->setOffsetX(110);

Exact semantic's of API can be discussed in #1160

What is the current behaviour?

Currently, there is only support for One Cell positioning

What are the steps to reproduce?

Please see above

Which versions of PhpSpreadsheet and PHP are affected?

All current releases

[sgarwood]

Expands on #643 and #126

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.
If this is still an issue for you, please try to help by debugging it further and sharing your results.
Thank you for your contributions.

[oleibman]

Implemented by PR #2532 and subsequent changes in March 2022.