[#9708] wire up persons to BaseFacade

[JonasCir]

Ticks one box (i.e., PersonFacade) of #9708

While I was waiting for news about the current S2S crisis, I decided to do something useful and conducted some code gardening :farmer:

[JonasCir]

@MartinWahnschaffe Maybe you can take a look at some point in time as Maté is enjoying its well deserved vacation? :beach_umbrella:

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Edit: Tests are fixed now

[JonasCir]

rebased and test fixed

[JonasCir]

Ah, one annotation was wrong, starts now :)