gen_component: more generic handling of gen_component provided default messages (ping, send_to_group_member)
gen_component: more generic handling of gen_component provided default messages (ping, send_to_group_member)

* also fix these two messages not having breakpoint handling
-> this fixes paused nodes from churn_SUITE sometimes re-appearing in the ring maintenance because dn_cache gets a ping message through
digshock/scalaris,digshock/scalaris,digshock/scalaris,seyyed/scalaris,tectronics/scalaris,digshock/scalaris,tectronics/scalaris,digshock/scalaris,digshock/scalaris,tectronics/scalaris,seyyed/scalaris,seyyed/scalaris,tectronics/scalaris,tectronics/scalaris,tectronics/scalaris,seyyed/scalaris,seyyed/scalaris,seyyed/scalaris,seyyed/scalaris,digshock/scalaris,tectronics/scalaris