Add the quanitity Intensity in count per second (CPS) units

[ka-sarthak]

In a recent correspondence with Dr. Carsten Richter, he pointed out that a user might be interested in plotting intensity as counts or counts/sec depending on the situation. It will be a good idea to add Intensity (CPS) quantity in the current XRD schema.

It can be populated while parsing the data by combining intensity with integration time. Or using the existing quantities in normalize method.

[hampusnasstrom]

We might do this with something called a "derived quantity" in nomad. This way we don't store the data twice (or thrice if we also want normalized data).