Implemented roles and action timestamps. Added oermissions selector and interfaces

Moonlight.Api/Database/Entities/RoleMember.cs

@@ -0,0 +1,15 @@
+using Moonlight.Api.Database.Interfaces;
+
+namespace Moonlight.Api.Database.Entities;
+
+public class RoleMember : IActionTimestamps
+{
+    public int Id { get; set; }
+
+    public Role Role { get; set; }
+    public User User { get; set; }
+    
+    // Action timestamps
+    public DateTimeOffset CreatedAt { get; set; }
+    public DateTimeOffset UpdatedAt { get; set; }
+}