[Feature] Implement read operations on the Solana blockchain

[selinafeng]

Using the API endpoints here (or you can use other ones if you find better options), implement the following read-side features for the Solana blockchain:

/solana/address/<address hash> - display information about the address (balance, privileged roles) and a table of recent transactions for that address.
/solana/transaction/<transaction hash> - display information about the transaction
/solana - USDC overview information, similar to what we have for Ethereum

[1] You can verify information using the Solana blockchain explorer: https://explorer.solana.com/address/EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v