Ask user arrival information at registration

When a user register to a tournament, we need to ask him the city they came from and there means of transport.

Answering to this form need to optional.

We need to specify that this collected data will be anonymized and will be used to compute the ecological impact of the event.

Linked to https://github.com/InsaLan/backend-insalan.fr/issues/203