Preserve content-encoding in response content interceptor

This solves issues with gzip encoded content where the encoding was missing after
the interceptor. This has to be handled in apache http v5 because
ByteArrayEntity now requires a non null content encoding to make sure
the encoding is preserved. Apache will decompress the gzip
automaticalyly if content encoding is set to gzip.

Author: shahzebs

src/main/java/no/digipost/api/client/internal/http/response/interceptor/ResponseContentSHA256Interceptor.java

@@ -52,7 +52,7 @@ public void process(HttpResponse response, EntityDetails entityDetails, HttpCont
                                     X_Content_SHA256, response.getCode())));
             byte[] entityBytes = EntityUtils.toByteArray(entity);
             validerBytesMotHashHeader(hashHeaderValue, entityBytes);
-            classicHttpResponse.setEntity(new ByteArrayEntity(entityBytes, ContentType.parse(entityDetails.getContentType())));
+            classicHttpResponse.setEntity(new ByteArrayEntity(entityBytes, ContentType.parse(entityDetails.getContentType()), entityDetails.getContentEncoding()));
         }
     }