p2p: support private peer IDs in new p2p stack (#6409)

Pass a set of private peer ids to the `PeerManager` and any node that exists in this set is not returned in the `Advertise` method.

closes: #6405

libs/strings/string.go

@@ -5,6 +5,29 @@ import (
 	"strings"
 )
 
+// SplitAndTrimEmpty slices s into all subslices separated by sep and returns a
+// slice of the string s with all leading and trailing Unicode code points
+// contained in cutset removed. If sep is empty, SplitAndTrim splits after each
+// UTF-8 sequence. First part is equivalent to strings.SplitN with a count of
+// -1.  also filter out empty strings, only return non-empty strings.
+func SplitAndTrimEmpty(s, sep, cutset string) []string {
+	if s == "" {
+		return []string{}
+	}
+
+	spl := strings.Split(s, sep)
+	nonEmptyStrings := make([]string, 0, len(spl))
+
+	for i := 0; i < len(spl); i++ {
+		element := strings.Trim(spl[i], cutset)
+		if element != "" {
+			nonEmptyStrings = append(nonEmptyStrings, element)
+		}
+	}
+
+	return nonEmptyStrings
+}
+
 // StringInSlice returns true if a is found the list.
 func StringInSlice(a string, list []string) bool {
 	for _, b := range list {