samples: philosophers: test different configurations

The demo can be configured to use different object types for its
synchronization, so test all of them.

The demo can also be configured to work with static objects or dynamic
objects, byt default the demo uses dynamic objects, add a test for
static objects.

Also, the demo can be configured to work with threads of the same
priority or not, so enable both options for testing

Signed-off-by: Anas Nashif <anas.nashif@intel.com>