refac: update-mapbox-tileset config

[thenav56]

Addresses

• Refactor related to update-mapbox-tileset command

Changes

• replace if/else with TilesetsConfig
• replace print with self.stdout/self.stderr

[szabozoltan69]

Beautiful clean-up

[thenav56]

Hey @szabozoltan69

I did a bit more refactoring and separated the tileset management logic out of the command.

Changes: 6e9a36c
Here is the base manager:
https://github.com/IFRCGo/go-api/blob/refac/update-mapbox-tileset/mapbox/tilesets/base.py

Here are the tileset managers for each type:
https://github.com/IFRCGo/go-api/blob/refac/update-mapbox-tileset/mapbox/tilesets/managers.py

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Why the change?
We were using hardcoded values throughout, which made it difficult to test with non-IFRC accounts (personal account). Now we can use different Mapbox usernames for testing.
This will also be helpful when we work on the geo refactoring later.

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When you have time please review this.

[szabozoltan69]

Great and very useful job, dear @thenav56
I appreciate a lot that those mapbox/admin2/* files are now removed, it was so tedious to use them.