WIP: Add WIP feature support for w:moveTo and w:moveFrom

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fix #794

This should be a good start for w:moveTo and w:moveFrom operations support. Currently, it allows to display moved elements using Paragraph::raw_text() without duplicating the text

What does this change?

Added moveTo and moveFrom enum variants for XMLElement and Paragraph with the needed refactor. Most changes are copy/pasted from Delete equivalents.

Changed Paragraph::raw_text() so that it displays moved elements correctly.

WIP

This is WIP, some additional tests need to be written. For example, it should not be allowed to add a moveFrom element without adding a moveTo element and vice versa. Also, there is some duplicated code that could probably be avoided with traits.

I made this change as a quick fix for my needs for my work. As this change is enough for me to work, I cannot continue working on this project on my "working time", and I am not sure if I have enough free time to keep working on it.

Also, I’m not super familiar with the .docx format :

• is this change applicable to other DocumentChild variants such as Table ?
• Are there other MoveFromChild and MoveToChild variants that should be taken into account ?
• …

Consider this a starter for a new feature implementation.

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PS: I did not run the docx-wasm tests as I do not have and cannot install the pnpm command on my company laptop.