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

Move SecretsManager files to directories called SecretsManager and add CodeOwners

src/Core/SecretsManager/Entities/Project.cs

@@ -0,0 +1,30 @@
+#nullable enable
+using Bit.Core.Entities;
+using Bit.Core.Utilities;
+
+namespace Bit.Core.SecretsManager.Entities;
+
+public class Project : ITableObject<Guid>
+{
+    public Guid Id { get; set; }
+
+    public Guid OrganizationId { get; set; }
+
+    public string? Name { get; set; }
+
+    public DateTime CreationDate { get; set; } = DateTime.UtcNow;
+
+    public DateTime RevisionDate { get; set; } = DateTime.UtcNow;
+
+    public DateTime? DeletedDate { get; set; }
+
+    public virtual ICollection<Secret>? Secrets { get; set; }
+
+    public void SetNewId()
+    {
+        if (Id == default(Guid))
+        {
+            Id = CoreHelpers.GenerateComb();
+        }
+    }
+}