User can share maps they create with other users or with general public

[mikefab]

When saving a map, a user should be able to determine if the map should be auth protected or if it is available to the public. As a bonus, build a check or flag that prevents a user from saving a map as publicly accessible if it points to a dataset that is marked as sensitive.

The user should also be able to see a list of their saved maps. The list might the name of the map and/or include a search feature. From this list, it should be easy to share the URL.

Test datasets and sample maps will be made available on Azure storage or via a drive