Refactroing: instead of composition place values make an interface

[tobsesHub]

Here is my attempt to refactor the Place class as an interface.

While programming, I wasn't so sure anymore if this is really a good idea, because:

1. is this a case of "composition over of inheritance"? So maybe the current composition solution is the better one. I also didn't find any advantages in the usage in our case. (Actually I have to use instance of instead of handling Optional now)
2. my solution for deserialization I don't like very much. Instead of using Jackson default parsing, I had to parse many properties myself, which is very error-prone. I could make this maybe a bit easier by changing the records to non-final classes. But that might have drawbacks when using the library.

So we can merge this, I can improve it if you have an idea, or I can close this pr if you think it's better to keep the code.