fix: pptx shape order

[mawi12345]

The mspowerpoint backend iterates through the shapes in the slides in the order in which they were inserted. This is particularly a problem if the title of a slide is deleted and inserted again (by clicking on the placeholder). This PR changes the order from top to bottom and from left to right.

Checklist:

• Documentation has been updated, if necessary.
• Examples have been added, if necessary.
• Tests have been added, if necessary.

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[cau-git]

@mawi12345 I agree that the reading order is ill-defined in Powerpoint since it is not necessarily the order in which elements were inserted or created. However, sorting it from top to bottom and from left to right is not a safe approach either. I would propose to address this in a more generic way by leveraging the reading-order model we have in docling already. It is currently applied in our PDF pipeline only. For reference, check here.