Added metadata in results to search for measurements and in particular xrd

Merged Jose Marquez Prieto requested to merge 1674-xrd-hackathon into develop

This adds a few sections and quantities to the current results to make measurements searchable. It will start being populated from schemas and parsers developed in

@himanel1 can you have a look at this? Should be a quick one for you. In the future, we can refactor the EBSD database and remove the top-level measurements section.

@lucamghi, @sbrueck, @sanbrock, @hnaesstroem I tagged you just in case you want to have a second look at it.

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