feat: Allow to reorder options for "multiple" question type in backend

[Chartman123]

This uses backend part of the original PR #2092 by @susnux to include it in the 4.3 release. The frontend still needs some more love and will be part of 5.0

[codecov]

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Additional details and impacted files

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[Chartman123]

First part for closing #354

[Chartman123]

@Koc @susnux I think this is ready now, please review :) I would then create a new release 4.3 :)

[hamza221]

Maybe also a repair step to add order to existing options instead of setting it as NULL ?

[Chartman123]

Maybe also a repair step to add order to existing options instead of setting it as NULL ?

Good idea :) But maybe as a follow up in #2092.

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