grpc GetBlock api (#2955)

cmd/rpcdaemon/cli/config.go

cmd/rpcdaemon/commands/call_traces_test.go

cmd/rpcdaemon/commands/corner_cases_support_test.go

cmd/rpcdaemon/commands/daemon.go

cmd/rpcdaemon/commands/debug_api_test.go

cmd/rpcdaemon/commands/eth_api.go

cmd/rpcdaemon/commands/eth_api_test.go

cmd/rpcdaemon/commands/eth_call_test.go

cmd/rpcdaemon/commands/eth_ming_test.go

cmd/rpcdaemon/commands/eth_subscribe_test.go

cmd/rpcdaemon/commands/send_transaction_test.go

cmd/rpcdaemon/commands/trace_adhoc_test.go

cmd/rpcdaemon/commands/txpool_api_test.go

cmd/rpcdaemon/interfaces/interfaces.go

cmd/rpcdaemon/main.go

cmd/rpcdaemon/rpcdaemontest/test_util.go

cmd/rpcdaemon/services/eth_backend.go

eth/backend.go

ethdb/privateapi/ethbackend.go

go.mod