Adds "MayRunAs" value among other group strategies. This strategy
allows to define a certain range of GIDs for FSGroupStrategy and
SupplementalGroupStrategy in a PSP.
This new strategy works similarly to the "MustRunAs" one, except that
when no GID is specified in a pod/container security context then no
GID is generated for the respective containers.
Resolves#56173
We had IDRange in both types prior 9440a68744 commit that splitted it
into UserIDRange/GroupIDRange. Later, in c91a12d205 commit we had to
revert this changes because they broke backward compatibility but
UserIDRange/GroupIDRange struct left in the internal type.
This commit removes these leftovers and reduces the differences
between internal and external types.
