[Algolia] Multiple Sortby fields not supported

[alexander-schranz]

Currently we are not supporting to sortby document by multipl sortBy in the Algolia adapter. It has the reasons because in Algolia we need to create for each sortableField an own replica with a custom ranking.

https://github.com/schranz-search/schranz-search/blob/0fa3b56ee10521fd481ed5fe5358f38cb061ccb0/packages/seal-algolia-adapter/AlgoliaSchemaManager.php#L44-L71

And so we can just search by one specific sorted index: https://github.com/schranz-search/schranz-search/blob/0fa3b56ee10521fd481ed5fe5358f38cb061ccb0/packages/seal-algolia-adapter/AlgoliaConnection.php#L104-L107