Add XGRChain Mainnet (Chain ID 1643) RPC Support

Please evaluate XGRChain Mainnet for GetBlock RPC support. XGRChain is a public EVM-compatible Layer 1 blockchain. Chain ID: 1643 Native currency: XGR (18 decimals) Public RPC: https://rpc.xgr.network Explorer: https://explorer.xgr.network Website: https://xgr.network Documentation: https://xgr.network/docs/ This is a technical support request only. Please let us know if additional technical information is required.