New result reader with delegation to existing and consolidated reader #385
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This MR adds the main result reader that can delegate.
It is was not possible to re-use the data loaded during delegation setup for both cases of delegation. The reason is they use different implementations of the delayed loading which returns different results. For example what is expected to be the full data vs a file position pointer, 'data_3' is different for the two implementations in this way.
So, instead of trying to re-use it for one of the implementations we can instead try to minimize the amount of data read during the delegation setup. This is done by using the delayed loader for the consolidated result and add support to it to not load in any data_4 (we only need to ask for 'data_3' and 'data_4' other data will then be ignored entirely).