Simplify working with dynamic/catalog properties on the storefront

[tatarincev]

The main goal needs to simplify the process of working with Dynamic/Catalog properties from code through the definition of syntax sugar and fluent api.

Here is code demonstrates how to work with catalog properties from code

 foreach (var record in planogramRecords)
                    {
                        var product = products.FirstOrDefault(x => x.Id == record.Product);
                        if (product != null)
                        {
                            var planogramProperty = product.Properties.FirstOrDefault(x => x.Name == "planogram");
                            if (planogramProperty != null)
                            {
                                var dictValues = _propertiesApi.GetPropertyValues(planogramProperty.Id);
                                var dictValue = dictValues?.FirstOrDefault(x => x.Value.ToString().EqualsInvariant(record.Planogram));
                                if (dictValue != null)
                                {
                                    planogramProperty.Values = new productDto.PropertyValue[] { new productDto.PropertyValue { Value = record.Planogram, ValueId = dictValue.ValueId, PropertyName = "planogram" } };
                                }
                            }
                        }
                    }
                    await _productsApi.SaveProductsAsync(products.ToList());

And with the DynamicProperies

 foreach (var store in stores)
                    {
                        var organization = new Organization { Id = store.Id, Name = store.Id, Description = store.Address };
                        if (store.Planogram != null)
                        {
                            var properties = await _dynamicPropertiesApi.GetPropertiesAsync("VirtoCommerce.Domain.Customer.Model.Organization");
                            var planogramProp = properties.FirstOrDefault(x => x.Name.EqualsInvariant("planogram"));
                            if (planogramProp != null)
                            {
                                var dictValues = await _dynamicPropertiesApi.GetDictionaryItemsAsync(planogramProp.ObjectType, planogramProp.Id);
                                var dictValue = dictValues.FirstOrDefault(x => x.Name.EqualsInvariant(store.Planogram));
                                if (dictValue != null)
                                {
                                    var dynProp = planogramProp.JsonConvert<AutoRestClients.CoreModuleApi.Models.DynamicObjectProperty>().ToDynamicProperty();
                                    dynProp.DictionaryValues = new[] { dictValue.ToDictItem() };
                                    organization.DynamicProperties = new DynamicProperty[] { dynProp };
                                }
                            }
                        }
                        await _memberService.CreateOrganizationAsync(organization);