new prop for List.Accordion to optionally expand upwards instead of downwards

**Is your feature request related to a problem? Please describe.**
List.Accordion always expands downwards. It would be great to have a second option which is 'upwards'

**Describe the solution you'd like**
Introduce a new prop such as expandDirection = 'downwards' (default) | 'upwards'

**Describe alternatives you've considered**
none

**Additional context**
none