Draft: Map place childs

Main MRs (To-be-reviewed):

coopdevs/community-maps/community-maps-backend!40 (merged)

coopdevs/community-maps/community-maps-frontend!79 (merged)

Trello:

https://trello.com/c/WjpG1G3N/569-c1-id6-ep20-multiples-xinxetes-al-frontend-iframe-amb-diferents-geolocalitzacions-mateix-nom-de-ce-apuntant-a-una-mateix-registr

https://trello.com/c/qDNGznnl/307-c1-id6-ep20-id-asistent-de-gesti%C3%B3-multiples-xinxetes

This MR:

When a user accepts to move a submission to a new place and the place is already open. We'll create a partner as a potential cooperator candidate