add InsinMessageFormatter

Inspectron.Epson/PrintServer/Telemetry/InsinMessageFormatter.cs

@@ -0,0 +1,26 @@
+using System.Text;
+
+namespace Inspectron.Epson.PrintServer.Telemetry;
+
+public static class InsinMessageFormatter
+{
+    public static string Format(params (string Key, string? Value)[] pairs)
+    {
+        var sb = new StringBuilder();
+        foreach (var (key, value) in pairs)
+        {
+            if (string.IsNullOrEmpty(key)) continue;
+            if (sb.Length > 0) sb.Append(' ');
+            sb.Append(key).Append('=').Append(FormatValue(value));
+        }
+        return sb.ToString();
+    }
+
+    private static string FormatValue(string? value)
+    {
+        if (string.IsNullOrEmpty(value)) return string.Empty;
+        if (value.IndexOf(' ') < 0 && value.IndexOf('"') < 0) return value;
+        var escaped = value.Replace("\\", "\\\\").Replace("\"", "\\\"");
+        return $"\"{escaped}\"";
+    }
+}