feat: add map full data mgmt

Context:

In !35 (merged) we've prepared base of map data management but without covering aspect of communication with API. !35 (merged) creates only solution for handling client data.

Objective:

This PR adds data management of map data fetched from the backend.

It includes:

• redux boilerplate & fetching of: map, backgrounds, overlays, models
• fix of redux boilerplate: project (previously the default value was an empty array)
• unit tests of the above

What is not included:

• whole business logic of firing actions and using this data, it'll be excluded to other PR

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After draft

Additionally:

• extracted reducers to separate variable as it's completely unnecessary to copy this object into utils every time we add new reducer