openharmony-standard-3.0: Add System Ability services

These are services using the System Ability framework through the
executable sa_main. These services depend on and are started after the
System Ability Manager service (samgr).

Most of them are noop for now. No process is created after sa_main exits
for all of these services.

Signed-off-by: Thierry Escande <thierry.escande@huawei.com>