Add ThirdPartyModule entity with auditing support

Introduced the ThirdPartyModule entity mapped to the TBDD_3RD_PARTY_MODULES table using Entity Framework. The class includes properties for module details and auditing (added/changed by and when), implements IHasChangedWhen and IHasChangedWho interfaces, and uses conditional compilation for .NET Framework and nullable reference types. Data annotations and schema mapping attributes were added for precise database integration.

EnvelopeGenerator.Domain/Entities/ThirdPartyModule.cs

@@ -0,0 +1,61 @@
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using EnvelopeGenerator.Domain.Interfaces.Auditing;
+#if NETFRAMEWORK
+using System;
+#endif
+
+namespace EnvelopeGenerator.Domain.Entities
+{
+    [Table("TBDD_3RD_PARTY_MODULES", Schema = "dbo")]
+    public class ThirdPartyModule : IHasChangedWhen, IHasChangedWho
+    {
+        [Key]
+        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
+        [Column("GUID")]
+        public int Id { get; set; }
+
+        [Required]
+        [Column("ACTIVE", TypeName = "bit")]
+        public bool Active { get; set; }
+
+        [Required]
+        [Column("NAME", TypeName = "varchar(50)")]
+        public string Name { get; set; }
+
+        [Column("DESCRIPTION", TypeName = "varchar(500)")]
+        public string
+#if nullable
+        ?
+#endif
+            Description { get; set; }
+
+        [Required]
+        [Column("LICENSE", TypeName = "varchar(max)")]
+        public string License { get; set; }
+
+        [Required]
+        [Column("VERSION", TypeName = "varchar(20)")]
+        public string Version { get; set; }
+        
+        [Column("ADDED_WHO", TypeName = "varchar(50)")]
+        public string
+#if nullable
+        ?
+#endif
+            AddedWho { get; set; }
+
+        [Column("ADDED_WHEN", TypeName = "datetime")]
+        public DateTime? AddedWhen { get; set; }
+
+        [Column("CHANGED_WHO", TypeName = "varchar(50)")]
+        public string
+#if nullable
+        ?
+#endif
+            ChangedWho { get; set; }
+
+        [Column("CHANGED_WHEN", TypeName = "datetime")]
+        public DateTime? ChangedWhen { get; set; }
+    }
+}