Added source exception to rethrown crypto exception

Author: rickle-msft

sdk/storage/azure-storage-blob-cryptography/src/main/java/com/azure/storage/blob/specialized/cryptography/EncryptedBlobClientBuilder.java

@@ -511,7 +511,7 @@ public EncryptedBlobClientBuilder endpoint(String endpoint) {
             }
         } catch (MalformedURLException ex) {
             throw logger.logExceptionAsError(
-                new IllegalArgumentException("The Azure Storage Blob endpoint url is malformed."));
+                new IllegalArgumentException("The Azure Storage Blob endpoint url is malformed.", ex));
         }
         return this;
     }