refactor(.Extensions): Extensions nach Gruppen aufgeteilt.

- erstellt dekodierende Erweiterungen.
 - Kodierungserweiterungen erstellt.
 - XSS-Erweiterungen in das Extensions-Paket verschoben.
 - EncodeTypes vom Paket Common in das Paket Constants verschoben.

EnvelopeGenerator.Extensions/LoggerExtensions.cs

@@ -0,0 +1,42 @@
+using Microsoft.Extensions.Logging;
+using System.Text;
+
+namespace EnvelopeGenerator.Extensions
+{
+    public static class LoggerExtensions
+    {
+        public static void LogEnvelopeError(this ILogger logger, string envelopeReceiverId, Exception? exception = null, string? message = null, params object?[] args)
+        {
+            var sb = new StringBuilder().AppendLine(envelopeReceiverId.DecodeEnvelopeReceiverId().ToTitle());
+
+            if (message is not null)
+                sb.AppendLine(message);
+
+            if (exception is null)
+                logger.Log(LogLevel.Error, sb.ToString(), args);
+            else
+                logger.Log(LogLevel.Error, exception, sb.AppendLine(exception.Message).ToString(), args);
+        }
+
+        public static void LogEnvelopeError(this ILogger logger, string? uuid, string? signature = null, Exception? exception = null, string? message = null, params object?[] args)
+        {
+            var sb = new StringBuilder($"Envelope Uuid: {uuid}");
+
+            if (signature is not null)
+                sb.AppendLine().Append($"Receiver Signature: {signature}");
+
+            if (message is not null)
+                sb.AppendLine().Append(message);
+
+            if (exception is null)
+                logger.Log(LogLevel.Error, sb.ToString(), args);
+            else
+                logger.Log(LogLevel.Error, exception, sb.ToString(), args);
+        }
+
+        public static string ToTitle(this (string? UUID, string? Signature) envelopeReceiverTuple)
+        {
+            return $"UUID is {envelopeReceiverTuple.UUID} and signature is {envelopeReceiverTuple.Signature}";
+        }
+    }
+}