core: implement Uphold= dependency type

This is like a really strong version of Wants=, that keeps starting the
specified unit if it is ever found inactive.

This is an alternative to Restart= inside a unit, acknowledging the fact
that whether to keep restarting the unit is sometimes not a property of
the unit itself but the state of the system.

This implements a part of what #4263 requests. i.e. there's no
distinction between "always" and "opportunistic". We just dumbly
implement "always" and become active whenever we see no job queued for
an inactive unit that is supposed to be upheld.

src/core/unit-dependency-atom.h

@@ -32,6 +32,11 @@ typedef enum UnitDependencyAtom {
         /* Stop our unit if the other unit happens to inactive */
         UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT            = UINT64_C(1) << 7,
 
+        /* Start this unit whenever we find it inactive and the other unit active */
+        UNIT_ATOM_START_STEADILY                      = UINT64_C(1) << 9,
+        /* Whenever our unit becomes active, add other unit to start_when_upheld_queue */
+        UNIT_ATOM_ADD_START_WHEN_UPHELD_QUEUE         = UINT64_C(1) << 10,
+
         /* If our unit unexpectedly becomes active, retroactively start the other unit too, in "replace" job
          * mode */
         UNIT_ATOM_RETROACTIVE_START_REPLACE           = UINT64_C(1) << 11,