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/time_meas.c

@@ -27,7 +27,7 @@
 #include "assertions.h"
 #include <pthread.h>
 #include "common/config/config_userapi.h"
-#include <common/utils/threadPool/thread-pool.h>
+#include "common/utils/threadPool/notified_fifo.h"
 // global var for openair performance profiler
 int cpu_meas_enabled = 0;
 double cpu_freq_GHz  __attribute__ ((aligned(32)));