Move logic away from ApiCatalogBrowseFiltersController to make it extendable

[asvishnyakov]

vc-module-catalog/VirtoCommerce.CatalogModule.Web/Controllers/Api/CatalogBrowseFiltersController.cs

Lines 128 to 137 in f0f0cd5

	private IList<AggregationProperty> GetAllProperties(string catalogId, IEnumerable<string> currencies)
	{
	var result = _propertyService.GetAllCatalogProperties(catalogId)
	.Select(p => new AggregationProperty { Type = _attributeType, Name = p.Name })
	.ToList();
	result.AddRange(currencies.Select(c => new AggregationProperty { Type = _priceRangeType, Name = $"Price {c}", Currency = c }));
	result.Add(new AggregationProperty { Type = _attributeType, Name = $"__outline" });
	return result;

Expected behavior

We should have ability to extend the list of filtration properties

Actual behavior

We can't do that.

Steps to reproduce

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[Woland2k]

Would be helpful to understand the scenario for which it needs to be extended.

[asvishnyakov]

@Woland2k We want to add custom aggregation property to receive it as part of aggregations of product in storefront and show the number of products available in filter, for example. Right now the only thing we can do is to hard code it in theme or "emulate" aggregations in storefront