Saving of TUIDs and other quantities in dataset
We need to have the ability to save TUIDs of experiments in the quantify dataset. This is especially useful where we do nested experiments which generate many different datasets for sub-experiments in their own datafiles. It would be useful to save the TUIDs of these sub experiments in the main dataset. This relates closely to @slavoutich's work on dataset V2 #139 !352 (closed).
Currently we can save a timestamp for the sub-experiments by adding this as a new gettable parameter. However, we can currently only save floats as gettables, not strings or TUIDs. Therefore we must save a UTC timestamp, and there may be issues when converting this back and forth to the TUID format (different timezones can cause problems, for example).
Furthermore, it would be nice to be able to save different types of data using the gettable, not just floats (strings etc).