CLI: Add switch for triggering a platform shutdown

Use-case: Other CLI switches trigger some algortihms in some automated
tasks that use AF3. After processing these switches, the application
must be shutdown to indicate the end of processing in AF3.

Issue-Ref: 3994
Issue-Url: https://af3-developer.fortiss.org/issues/3994


Signed-off-by: Alexander Diewald <diewald@fortiss.org>