M12 snapshot schema repo SHA 36c843d37aa42d2110b00f01469ea70887862bfb (2022-05-20)

Changes, additions as explained in the ChangeReport https://gitlab.opengroup.org/osdu/subcommittees/data-def/work-products/schema/-/blob/master/E-R/ChangeReport.md#snapshot-2022-03-18-towards-m12
Schema scope is now PUBLISHED (=read-only)