refactor: replace Split in loops with more efficient SplitSeq (#2502)

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## Overview

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Optimize code using a more modern writing style which can make the code
more efficient and cleaner.

Official support by Go Team.
https://pkg.go.dev/golang.org/x/tools/gopls/internal/analysis/modernize.

Signed-off-by: pinglanlu <pinglanlu@outlook.com>

Author: pinglanlu

pkg/sync/sync_service.go

@@ -385,9 +385,9 @@ func getPeers(seeds string, logger logging.EventLogger) []peer.ID {
 	if seeds == "" {
 		return peerIDs
 	}
-	sl := strings.Split(seeds, ",")
+	sl := strings.SplitSeq(seeds, ",")
 
-	for _, seed := range sl {
+	for seed := range sl {
 		maddr, err := multiaddr.NewMultiaddr(seed)
 		if err != nil {
 			logger.Error("failed to parse peer", "address", seed, "error", err)