feat StayExport - Initial Implementation

- Created models for DB and DTOs: StayExportFile
- Added required db migrations.
- Added StayExportService and StayExportServiceFactory for stay exporting services.
- Added configuration options required for StayExport.

src/Somnia.GuestLog/Models/Entities/GuestAddress.cs

@@ -1,3 +1,5 @@
+using Somnia.GuestLog.Infrastructure;
+
 namespace Somnia.GuestLog.Models.Entities;
 
 public class GuestAddress : BaseEntity
@@ -9,5 +11,5 @@ public class GuestAddress : BaseEntity
     public required string AddressCountry { get; set; }
     public string? ZipCode { get; set; }
 
-    public override string GetFullKey() => "N/A";
+    public override string GetFullKey() => DbConsts.PK_NotApply;
 }

src/Somnia.GuestLog/Models/Entities/StayExportFile.cs

@@ -0,0 +1,28 @@
+using Somnia.GuestLog.Enums.Models;
+
+namespace Somnia.GuestLog.Models.Entities;
+
+public class StayExportFile : BaseEntity
+{
+    public long Id { get; set; }
+
+    public required StayExportFormat ExportFormat { get; set; }
+    public required StayExportParams ExportParams { get; set; }
+
+    public required StayExportFileResult ExportResult { get; set; }
+
+    /// <summary>
+    /// Path to exported data.
+    /// Should be relative to configured Storage.
+    /// </summary>
+    public string? ExportedPath { get; set; }
+
+
+    /// <summary>
+    /// Date/Time when export file was generated.
+    /// </summary>
+    public required DateTime ExportTime { get; set; }
+
+
+    public override string GetFullKey() => $"{Id}";
+}

src/Somnia.GuestLog/Models/Entities/StayExportParams.cs

@@ -0,0 +1,19 @@
+using Somnia.GuestLog.Enums.Models;
+using Somnia.GuestLog.Infrastructure;
+
+namespace Somnia.GuestLog.Models.Entities;
+
+/// <summary>
+/// This class store params used on StayExport. 
+/// Different params apply for different export types.
+/// </summary>
+public class StayExportParams : BaseEntity
+{
+    public required StayExportParamType ExportType { get; set; }
+
+    public DateTime? ExportPeriodStart { get; set; }
+    public DateTime? ExportPeriodEnd { get; set; }
+
+
+    public override string GetFullKey() => DbConsts.PK_NotApply;
+}