Add IsLoadBalancedRPC flag #483

Job	Run time
detect-modules	5s
golangci-lint (tools/evm-chain-bindings/examples/basic)	24s
golangci-lint (multinode)	57s
golangci-lint (tools/evm-chain-bindings)	1m 21s
golangci-lint (chains)	48s
golangci-lint (capabilities)	50s
golangci-lint (metrics)	41s
golangci-lint-result	3s
	5m 9s

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