Refactor (F1AP/RRC): convert SIB containers to byte_array_t

Unify SIB container handling by introducing a typed SIB enum and storing
SIB payloads as byte_array_t across common NR types, F1AP helpers, MAC,
and RRC DU setup code.

Changes:
- Include byte_array support in nr_common.h, add nr_sib_type_t (NR_SIB_1–NR_SIB_21),
  and change nr_SIBs_t to hold only nr_sib_type_t SIB_type.
- Switch f1ap_sib_msg_t in f1ap_messages_types.h to use a byte_array_t SI_container
  instead of raw pointer and length fields.
- Update F1AP encode/decode, equality, copy, and free helpers in
  f1ap_interface_management.c to work on SI_container.buf / SI_container.len and
  use eq_byte_array, copy_byte_array, and free_byte_array.
- Adapt F1AP tests in f1ap_lib_test.c to build and inspect SIB containers via
  SI_container.buf and SI_container.len.
- Replace magic SIB numbers with nr_sib_type_t values in gnb_config.c
  (get_sys_info and fill_du_sibs) to validate and configure DU SIBs.
- Rework nr_mac_configure_other_sib in NR_MAC_gNB/config.c to decode SIB2
  from a byte_array_t container, fix freeing by releasing the decoded sib2 on
  failure, and use NR_SIB_2 / NR_SIB_19 for CU/DU SIB selection.
- Add an add_si_msg helper in rrc_gNB_du.c and refactor the SIB2 branch of
  rrc_gNB_process_f1_setup_req to populate cell->SI_msg from encoded local
  byte array while iterating SIBs with FOR_EACH_SEQ_ARR.

common/utils/nr/nr_common.h

@@ -13,6 +13,7 @@
 #include <stdlib.h>
 #include "assertions.h"
 #include "common/utils/utils.h"
+#include "common/utils/ds/byte_array.h"
 
 #define MAX_SI_GROUPS 3
 #define NR_MAX_PDSCH_TBS 3824
@@ -79,10 +80,32 @@ static inline const char *rnti_types(nr_rnti_type_t rr)
 // the total shift is 2 * 15, in dB scale thats 10log10(2^(15*2))
 #define SQ15_SQUARED_NORM_FACTOR_DB 90.3089986992
 
+typedef enum {
+  NR_SIB_1 = 1,
+  NR_SIB_2,
+  NR_SIB_3,
+  NR_SIB_4,
+  NR_SIB_5,
+  NR_SIB_6,
+  NR_SIB_7,
+  NR_SIB_8,
+  NR_SIB_9,
+  NR_SIB_10,
+  NR_SIB_11,
+  NR_SIB_12,
+  NR_SIB_13,
+  NR_SIB_14,
+  NR_SIB_15,
+  NR_SIB_16,
+  NR_SIB_17,
+  NR_SIB_18,
+  NR_SIB_19,
+  NR_SIB_20,
+  NR_SIB_21,
+} nr_sib_type_t;
+
 typedef struct {
-  uint8_t *SIB_buffer;
-  int SIB_size;
-  int SIB_type;
+  nr_sib_type_t SIB_type;
 } nr_SIBs_t;
 
 typedef struct nr_bandentry_s {