feat(EnvelopeReceiverCache): zum Abrufen und Setzen von Caches über Envelope Receiver unter Verwendung von Standard-Schlüsselwörtern als Schnittstellenimplementierung erstellt.

- Erstellte Optionen.
 - Zu DI hinzugefügt.

EnvelopeGenerator.Application/Contracts/IEnvelopeReceiverCache.cs

@@ -0,0 +1,17 @@
+namespace EnvelopeGenerator.Application.Contracts
+{
+    public interface IEnvelopeReceiverCache
+    {
+        Task<string?> GetSmsCodeAsync(string envelopeReceiverId);
+
+        /// <summary>
+        /// Asynchronously stores an SMS verification code in the cache and returns the expiration date of the code.
+        /// </summary>
+        /// <param name="envelopeReceiverId">The unique identifier for the recipient of the envelope to associate with the SMS code.</param>
+        /// <param name="code">The SMS verification code to be stored.</param>
+        /// <returns>A task that represents the asynchronous operation. The task result contains the expiration date and time of the stored SMS code.</returns>
+        Task<DateTime> SetSmsCodeAsync(string envelopeReceiverId, string code);
+
+        Task<DateTime?> GetSmsCodeExpirationAsync(string envelopeReceiverId);
+    }
+}