Support for archiving by directory using AzureStorageDriver

[jizzaki]

The BaseDriver only supports archiving local folders and files.

Please add an override to the AzureStorageDriver with the following:

 protected override async Task AddDirectoryToArchiveAsync(ZipArchive zipFile, IDirectory directoryInfo, string root)
        {
            string entryName = $"{root}{directoryInfo.Name}/";

            zipFile.CreateEntry(entryName);
            var dirs = await directoryInfo.GetDirectoriesAsync();

            foreach (var dir in dirs)
            {
                await AddDirectoryToArchiveAsync(zipFile, dir, entryName);
            }

            var files = await directoryInfo.GetFilesAsync(null);

            foreach (var file in files)
            {
                var filePath = Path.GetTempFileName();
                File.WriteAllBytes(filePath, await AzureStorageAPI.FileBytesAsync(file.FullName));
                zipFile.CreateEntryFromFile(filePath, entryName + file.Name);
            }
        }

This will allow us to retrieve files from Azure Instead and write to a temp directory. This currently does not exist in the AzureStorageDriver and fails every time you try to archive by directory/folder name.

[fsmirne]

This can be closed. I handled it in the AzureStorage code.

[gordon-matt]

Thanks @fsmirne .
@jizzaki : for Azure driver issues, please open them in the Azure driver repo next time: https://github.com/fsmirne/elFinder.NetCore.AzureStorage.