Added authentication and authorization, updated dependency injections, removed hard-coded connection string

SchengenVisaApi/ApplicationLayer/DataAccessingServices/VisaApplications/Models/AddressModel.cs

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+namespace ApplicationLayer.DataAccessingServices.VisaApplications.Models;
+
+public class AddressModel
+{
+    /// City part of address
+    public Guid CityId { get; set; }
+
+    /// Street part of address
+    public string Street { get; set; } = null!;
+
+    /// Building part of address
+    public string Building { get; set; } = null!;
+}

SchengenVisaApi/ApplicationLayer/DataAccessingServices/VisaApplications/Models/PastVisitModel.cs

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+namespace ApplicationLayer.DataAccessingServices.VisaApplications.Models
+{
+    public class PastVisitModel
+    {
+        /// First day of <see cref="PastVisitModel"/>
+        public DateTime StartDate { get; set; }
+
+        /// Last day of <see cref="PastVisitModel"/>
+        public DateTime EndDate { get; set; }
+
+        /// Identifier of destination country of <see cref="PastVisitModel"/>
+        public Guid DestinationCountryId { get; set; }
+    }
+}

SchengenVisaApi/ApplicationLayer/DataAccessingServices/VisaApplications/Models/PlaceOfWorkModel.cs

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+namespace ApplicationLayer.DataAccessingServices.VisaApplications.Models;
+
+public class PlaceOfWorkModel
+{
+    /// Name of hirer
+    public string Name { get; set; } = null!;
+
+    /// <see cref="AddressModel"/> of hirer
+    public AddressModel Address { get; set; } = null!;
+
+    /// Phone number of hirer
+    public string PhoneNum { get; set; } = null!;
+}