[PM-3797 Part 4] Add Sends to new Key Rotation (#3442)

* add send validation

* add send repo methods

* add send rotation to delegate list

* add success test

src/Core/Auth/UserFeatures/UserKey/IRotateUserKeyCommand.cs

@@ -5,6 +5,9 @@ using Microsoft.Data.SqlClient;
 
 namespace Bit.Core.Auth.UserFeatures.UserKey;
 
+/// <summary>
+/// Responsible for rotation of a user key and updating database with re-encrypted data
+/// </summary>
 public interface IRotateUserKeyCommand
 {
     /// <summary>