[Manage observers] [BACKLOG] View observers on a map of the polling stations

[aniri]

Frontend

• display observers on a map
• the map is created automatically according to the polling station the observer is allocated to
• the pins should be inactive as default status, they activate once the observer logs in the app and selects the polling station he is in

Best practices

• codebase language should be English
• we :two_hearts: unit tests

[RaduCStefanescu]

This feature is currently moved to the backlog. We need to brainstorm a better way for distributing this information - what stations are not covered by mobile observers.