Avoid unmarshalling QueryRes.Hits into json default types

[georgantasp]

• Algolia Client Version: v3.30.1
• Language Version: 1.20

Description

During the unmarshalling of the QueryRes object, the existing implementation will completely unmarshal each hit object into json default types. As a result, the method QueryRes.UnmarshalHits remarshals the default types just to unmarshal again into the users's desired type. For large result sets and/or large objects, this can be wasteful.

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PR

Steps To Reproduce

res, _index.Search(query, params...)
algoliaObjectResults := []AlgoliaObject{}
res.UnmarshalHits(&algoliaObjectResults)