relay: add pullBinlogs interface for dm-worker to get local/grpc relay log

_utils/terror_gen/errors_release.txt

@@ -470,6 +470,7 @@ ErrWorkerDDLLockOpNotFound,[code=40075:class=dm-worker:scope=internal:level=high
 ErrWorkerTLSConfigNotValid,[code=40076:class=dm-worker:scope=internal:level=high], "Message: TLS config not valid, Workaround: Please check the `ssl-ca`, `ssl-cert` and `ssl-key` config in worker configuration file."
 ErrWorkerFailConnectMaster,[code=40077:class=dm-worker:scope=internal:level=high], "Message: cannot join with master endpoints: %v, error: %v, Workaround: Please check network connection of worker and check worker name is unique."
 ErrWorkerRelayConfigChanging,[code=40079:class=dm-worker:scope=internal:level=low], "Message: relay config of worker %s is changed too frequently, last relay source %s:, new relay source %s, Workaround: Please try again later"
+ErrWorkerPullBinlogsInvalidRequest,[code=40080:class=dm-worker:scope=internal:level=low], "Message: request for PullBinlogs is invalid, reason: %s, Workaround: Please check the worker's status using `dmctl list-member`"
 ErrTracerParseFlagSet,[code=42001:class=dm-tracer:scope=internal:level=medium], "Message: parse dm-tracer config flag set"
 ErrTracerConfigTomlTransform,[code=42002:class=dm-tracer:scope=internal:level=medium], "Message: config toml transform, Workaround: Please check the configuration file has correct TOML format."
 ErrTracerConfigInvalidFlag,[code=42003:class=dm-tracer:scope=internal:level=medium], "Message: '%s' is an invalid flag"

cmd/dm-syncer/main.go

@@ -74,7 +74,7 @@ func main() {
 		log.L().Info("", zap.Stringer("dm-syncer conf", conf))
 	})
 
-	sync := syncer.NewSyncer(conf, nil) // do not support shard DDL for singleton syncer.
+	sync := syncer.NewSyncer(conf, nil, nil) // do not support shard DDL, relay log for singleton syncer.
 	sc := make(chan os.Signal, 1)
 	signal.Notify(sc, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT)