feat(testnet): leaderboard

[grantdfoster]

Problem Statement

As we encourage miners to join our testnet 249, we also need a leaderboard and way for them to tell how they are doing / scoring so they can gain confidence they will do well on mainnet.

Acceptance Criteria

• There is a leaderboard which reflects the testnet agents

Proposed Solution

Once the post indexer is scraping testnet agents, the testnet validator (already running) will be able to correctly score said agents. Profile data and emissions data will then be written to our DB, and we can build a UI / leaderboard based on said data.

Technical Details

Can take the current leaderboard and filter by subnet 249 instead of subnet 59.

Related Issues / Dependencies

Post indexer to support scraping subnet 249 (testnet) agents:
#103