Ej/background maps settings flag

[lightlii]

Adds 'Experiments' list to settings menu with Background Maps as (currently only) option.
When Background Maps flag is activated, Background maps becomes an available option in settings.

closes #733

Preview

[ErikSin]

Good job! I left some minor comments/suggestions

2 things:

1. Once you rebase/merge from master, I would like to give it one more quick look before you merge.
2. I added alot of maps in testing. When it is loading the list of maps, it blocks the UI. I think that is fine when it is initially loading, but Tan stack query makes the API call everytime the window is out of focus and refocused, causing the UI to be blocked. I think we should disable invalidating the query. And when the users uploads a new map, we can use the refetch function to refresh the list. That way the list is not constantly trying to refetch even when we know there is no new data.

[ErikSin]

I believe the SettingsList is only being used by the Experiments Menu. Is that the case, I think we need to rename it as "ExperimentsList" or something more general like "listItem". Right now it implies it is being used for the settings menu not the experiments menu.

[lightlii]

Hey I think I've added what you requested in (2) in your comment above. So it's ready to look at again I'd say!

[lightlii]

Oops sorry, nope I missed error handling in ImportMapStyle, I can finish that up first thing tomorrow

[lightlii]

@ErikSin I've rebased from master, so this is ready for a last look over

[ErikSin]

Im unable to open it. Are you able to open it on your local device?

[lightlii]

Im unable to open it. Are you able to open it on your local device?

I don't have any issues running it. Lets look at that together when we call later

[ErikSin]

There are some import errors that the linter and vs code are catching

[lightlii]

These changes are in #744 so @ErikSin & I agreed to close and only review #744