Send azure upload (#1334)

* Add direct upload api endpoints

* Create azure upload service

* Update max file size

* Update send file upload test

* Move internationalization string to correct document

* Allow for one shot blob uploads

* Remove unused helper

* Use FileUploadService

Fallback to legacy method on old server implementations.

src/Core/Abstractions/IFileUploadService.cs

@@ -0,0 +1,9 @@
+using System.Threading.Tasks;
+using Bit.Core.Models.Domain;
+using Bit.Core.Models.Response;
+
+namespace Bit.Core.Abstractions {
+    public interface IFileUploadService {
+        Task UploadSendFileAsync(SendFileUploadDataResponse uploadData, CipherString fileName, byte[] encryptedFileData);
+    }
+}