5-improve-encrypted-storage (#6)

Added the use of DEK's for encryption of secrets. Both the KEK's and DEK's are stored in a way that you can have multiple key of which one is active. But the others are still available for decrypting. This allows for implementing key rotation.

Co-authored-by: eelke <eelke@eelkeklein.nl>
Co-authored-by: Eelke76 <31384324+Eelke76@users.noreply.github.com>
Reviewed-on: #6

IdentityShroud.TestUtils/Asserts/JsonObjectAssert.cs

@@ -1,6 +1,5 @@
 using System.Text.Json.Nodes;
 using System.Text.RegularExpressions;
-using Xunit;
 
 namespace IdentityShroud.TestUtils.Asserts;
 

IdentityShroud.TestUtils/Asserts/ResultAssert.cs

@@ -1,5 +1,4 @@
 using FluentResults;
-using Xunit;
 
 namespace IdentityShroud.Core.Tests;