feat(skeletons): add CMS 2016 SIM record skeletons

This commit introduces CMS 2016 SIM record skeletons containing only
persistent identifiers (title, record ID, DOI). The full record content
is not stored in this Git repository due to its size (2.3 GB). The
records are available in a separate tarball located at
`root://eospublic.cern.ch//eos/opendata/cms/upload/opendata.cern.ch/
data/records/cms-2016-sim-20241025.zip`.

Note that some of the CMS 2016 SIM records were not released, e.g. due
to the dataset being found invalid. The skeleton file
`cms-simulated-datasets-2016-unreleased.json` keeps their
originally-designed record IDs an DOIs just to keep track, even though
there were not used and/or registered. Good to avoid any possible
mis-attribution.

Closes #3667

Author: tiborsimko