Frankreed/Leaderboard precalculations now stored on Firebase!

[FrankreedX]

No description provided.

[artkolpakov]

great work!

[Gehrkej]

While it isn't directly correlated to this PR, currently there is no way to go back when looking at drill results. I think a simple solution would be adding appbar with a back chevron

[FrankreedX]

I'm thinking of tackling this in a different PR because I want to merge the 2 result screen into 1 file.

[Gehrkej]

Only have the one comment, the rest seems to be working well. Good job Frank! We will probably have to go over how you wanted to update the best_attempt table at some point but we will figure it out!

[solderq35]

This can probably be moved into another PR / put in github issues, but should we show a fixed amount of decimals on the frontend (add trailing zeros as padding where needed?)

[solderq35]

Other than the minor issue in the last comment I think it looks good. Tested regular user and test user, definitely seems to be loading the leaderboard much faster and less reads shown on firestore console as well.

[FrankreedX]

This can probably be moved into another PR / put in github issues, but should we show a fixed amount of decimals on the frontend (add trailing zeros as padding where needed?)

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