WIP REFACTOR: [react-ui-components] migrate ToggablePanel to TypeScript

[gradinarufelix]

[markusguenther]

Hey, we should use the typescript branch as base. The Panel is not migrated yet so if you have some sparetime to polish this it would be awesome. Otherwise I could hand over and create a new PR based on your commits. So you work will be used in the end :)

[markusguenther]

@gradinarufelix Do you want to work on that, or should we close it at the moment?

[mhsdesign]

i might take a look at that and continue here, when i find the time ;)

[kdambekalns]

I think this is way outdated…