[SM-460] Isolate SecretsManager files (#2616)

Move SecretsManager files to directories called SecretsManager and add CodeOwners

src/Core/SecretsManager/Entities/ApiKey.cs

@@ -0,0 +1,34 @@
+using System.ComponentModel.DataAnnotations;
+using Bit.Core.Entities;
+using Bit.Core.Utilities;
+
+namespace Bit.Core.SecretsManager.Entities;
+
+public class ApiKey : ITableObject<Guid>
+{
+    public Guid Id { get; set; }
+    public Guid? ServiceAccountId { get; set; }
+    [MaxLength(200)]
+    public string Name { get; set; }
+    [MaxLength(30)]
+    public string ClientSecret { get; set; }
+    [MaxLength(4000)]
+    public string Scope { get; set; }
+    [MaxLength(4000)]
+    public string EncryptedPayload { get; set; }
+    // Key for decrypting `EncryptedPayload`. Encrypted using the organization key.
+    public string Key { get; set; }
+    public DateTime? ExpireAt { get; set; }
+    public DateTime CreationDate { get; internal set; } = DateTime.UtcNow;
+    public DateTime RevisionDate { get; internal set; } = DateTime.UtcNow;
+
+    public void SetNewId()
+    {
+        Id = CoreHelpers.GenerateComb();
+    }
+
+    public ICollection<string> GetScopes()
+    {
+        return CoreHelpers.LoadClassFromJsonData<List<string>>(Scope);
+    }
+}