Blockchain Indexer - Get blockchain data from backend

[joelamouche]

Right now we are fetching badges and attestations directly from the front end by calling the wallet client.
This is not scalable and also we might want to do some after processing in the db.

• Implement indexer backbone ✨ add blockchain polling service #62 - most of the infra is here. It indexes activity token transfer events
• document indexer Add doc for indexer #83
• add auth for indexer Add auth for backend in indexer #82
• deploy indexer Deploy indexer #81
• Add real RPC endpoint URL to indexer Add real RPC endpoint URL to indexer
• Index more events in indexer #80 : badge events and attestation events
• Add backend endpoints to fetch badges from our TheGuildBadgeRegistry #23 blocked by Index more events in indexer #80
• Add backend endpoints to fetch attestations #105 blocked by Index more events in indexer #80