Support vertical aspect ration pictures in the carousel

# Feature Request

## Is your feature request related to a problem? Please describe

I personally find the carousel much more pleasant to scroll through than the gallery for pictures. I would like if a picture is in portrait mode that it is displayed correctly (and not cut off like now).

## Describe the solution you'd like

I would like that when a picture is added as an element its long side is fitted to the carousel in a way that no part of it is cut off.

## Describe alternatives you've considered

None.

## Additional context

TYPO3 v12 with the current version of the bootstrap package. Legacy installation.