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/ETHERNET/eth_udp.c

@@ -50,7 +50,6 @@
 #include "common_lib.h"
 #include "ethernet_lib.h"
 #include "openair1/PHY/sse_intrin.h"
-#include "common/utils/threadPool/thread-pool.h"
 
 //#define DEBUG 1
 

radio/ETHERNET/ethernet_lib.h

@@ -41,7 +41,6 @@
 #include <sys/socket.h>
 #include <net/if.h>
 #include <netinet/ether.h>
-#include <common/utils/threadPool/thread-pool.h>
 
 #define MAX_INST 4
 #define DEFAULT_IF "lo"