Use studio endpoint to fetch list of supported network

[saihaj]

# request

curl -X POST -H "Content-Type: application/json" -d '{
  "jsonrpc": "2.0",
  "method": "chain_list",
  "id": 1
}' https://api.studio.thegraph.com/deploy

# response

{"jsonrpc":"2.0","id":1,"result":{"hostedService":["mainnet","goerli","optimism","bsc","poa-sokol","chapel","poa-core","gnosis","fuse","matic","fantom","zksync2-testnet","boba","optimism-goerli","clover","moonbeam","moonriver","mbase","fantom-testnet","arbitrum-one","arbitrum-goerli","celo","fuji","avalanche","celo-alfajores","mumbai","aurora","aurora-testnet","harmony","polygon-zkevm-testnet","near-mainnet","near-testnet","cosmoshub-4","theta-testnet-001","osmosis-1","osmo-test-4","arweave-mainnet"],"studio":["mainnet","goerli","optimism","chapel","gnosis","matic","fantom","zksync2-testnet","optimism-goerli","clover","fantom-testnet","arbitrum-one","arbitrum-goerli","celo","fuji","avalanche","celo-alfajores","mumbai","aurora-testnet","base-testnet","polygon-zkevm","zksync-era","sepolia","polygon-zkevm-testnet","near-testnet","theta-testnet-001","osmo-test-4"]}}%  

internal ref: https://guild-oss.slack.com/archives/C020JKTV7L4/p1689029678170589