Default query filter

[Burgyn]

Closes #42

This PR add capability for applying default filter to every query.

---

In many cases, we want to define a global filter to apply to each query. For example: ParentId = 1, UserId = ActiveUser.Id, etc.

You can configurate query filter in DatabaseConfiguration class.

public class DatabaseConfiguration : DatabaseConfigurationBase
{
    public override void OnModelCreating(ModelConfigurationBuilder modelBuilder)
    {
        modelBuilder.Table("Document")
            .UseQueryFilter<Document>(entity => entity.UserId == 12 && entity.ParentId == 1);
    }
}

KORM will automatically add a condition ((UserId = 0) AND (ParentId = 1)) when calling any query using Query<Document>().

Except for direct sql calls like _database.Query<Document>().Sql("SELECT * FROM DOCUMENT").

⚠️ Configuration over modelBuilder.Table("tableName") is applayed for all entities with tableName. (like Document, DocumentDto, DocumentInfo, ...).

Ignoring global filters

If I need to call a query without these conditions, I must explicitly say:

_database.Query<Document>()
    .IgnoreQueryFilters()
    .ToList();