Add IsLoadBalancedRPC flag #479

Job	Run time
detect-modules	4s
golangci-lint (chains)	47s
golangci-lint (tools/evm-chain-bindings/examples/basic)	22s
golangci-lint (metrics)	41s
golangci-lint (capabilities)	54s
golangci-lint (multinode)	50s
golangci-lint (tools/evm-chain-bindings)	1m 25s
golangci-lint-result	4s
	5m 7s

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