[blocks]: Leaderboard block

[cdeck95]

Description

Something simple like the attached (but more shadCN design principles) that gives a unique style to the top 3, and then a normal leaderboard for the rest

Example

https://engineering.99x.io/creating-a-leaderboard-service-with-leaderboard-updates-using-aws-and-serverless-2e38efb66b2b