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

SchengenVisaApi/ApplicationLayer/AuthServices/Requests/RegisterApplicantRequest.cs

@@ -0,0 +1,4 @@
+namespace ApplicationLayer.AuthServices.Requests
+{
+    public record RegisterApplicantRequest(string Email, string Password);
+}

SchengenVisaApi/ApplicationLayer/AuthServices/Requests/UserLoginRequest.cs

@@ -0,0 +1,4 @@
+namespace ApplicationLayer.AuthServices.Requests
+{
+    public record UserLoginRequest(string Email, string Password);
+}