move services to separate project

+ add GetByUserId methods to Survey

SurveyLib.Core/Repositories/ISurveyRepository.cs

@@ -4,5 +4,5 @@ namespace SurveyLib.Core.Repositories;
 
 public interface ISurveyRepository : IGenericRepository<Survey>
 {
-    
+    Task<IEnumerable<Survey>> GetSurveysByUserIdAsync(int userId);
 }

SurveyLib.Core/Services/ISurveyService.cs

@@ -9,4 +9,5 @@ public interface ISurveyService
     Task DeleteSurveyAsync(int id);
     Task<IEnumerable<Survey>> GetSurveysAsync();
     Task<Survey?> GetSurveyAsync(int id);
+    Task<IEnumerable<Survey>> GetSurveysByUserIdAsync(int userId);
 }