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>

radio/COMMON/common_lib.h

@@ -37,7 +37,7 @@
 #include <sys/types.h>
 #include <openair1/PHY/TOOLS/tools_defs.h>
 #include "record_player.h"
-#include <common/utils/threadPool/thread-pool.h>
+#include "common/utils/threadPool/notified_fifo.h"
 
 /* default name of shared library implementing the radio front end */
 #define OAI_RF_LIBNAME        "oai_device"