New threadpool

- removed some whitespace noise.
 - cleaned up CMakeLists.txt
 - reintegrated task_manager.c into thread-pool.c
 - cleaned up some unnecessary code

Co-authored-by: Cedric Roux <cedric.roux@eurecom.fr>
Co-authored-by: Mikel Irazabal <mikel.irazabal@openairinterface.com>

common/utils/actor/actor.h

@@ -21,7 +21,7 @@
 
 #ifndef ACTOR_H
 #define ACTOR_H
-#include "thread-pool.h"
+#include "notified_fifo.h"
 
 #define INIT_ACTOR(ptr, name, core_affinity) init_actor((Actor_t *)ptr, name, core_affinity);