Add IsLoadBalancedRPC flag #482

Job	Run time
detect-modules	3s
golangci-lint (chains)	44s
golangci-lint (multinode)	52s
golangci-lint (capabilities)	53s
golangci-lint (tools/evm-chain-bindings)	1m 24s
golangci-lint (metrics)	41s
golangci-lint (tools/evm-chain-bindings/examples/basic)	24s
golangci-lint-result	3s
	5m 4s

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