feat: build leaderboard

[mr13tech]

on every confirmed submission - new dip nft is minted which changes user impact level. Such tx should trigger a mapper function, to map tx data into new leaderboard.

every appoved dcu sub - updates the boards

[HollowByt3]

I can take care of this by:
mapping the data from the api call to the front end

[HollowByt3]

Please see my PR and feel free to give feedbackhere