CSHARP-5328: Move AutoEncryptionOptions to Driver namespace (#1496)

Author: BorisDog

src/MongoDB.Driver/Encryption/AutoEncryptionOptions.cs renamed to src/MongoDB.Driver/AutoEncryptionOptions.cs

@@ -21,9 +21,10 @@
 using MongoDB.Driver.Core;
 using MongoDB.Driver.Core.Configuration;
 using MongoDB.Driver.Core.Misc;
+using MongoDB.Driver.Encryption;
 using MongoDB.Shared;
 
-namespace MongoDB.Driver.Encryption
+namespace MongoDB.Driver
 {
     /// <summary>
     /// Auto encryption options.