fix(nimble): Improve safety, fix bugs, and update docs across NimBLE examples

- Remove unused headers from examples
- Improve periodic adv/sync example functionality and readability
- Use ble_hs_id_infer_auto() instead of hardcoded BLE_OWN_ADDR_PUBLIC/RANDOM
- Add ble_hs_util_ensure_addr() calls in on_sync for proper address setup
- Use correct ext adv instance (0 instead of 1) in phy_prph, l2cap_coc, multi_conn
- Fix struct name: ble_gap_periodic_adv_enable_params -> ble_gap_periodic_adv_start_params
- Add CONFIG_BT_NIMBLE_GAP_SERVICE guards around ble_svc_gap_device_name_set
- Fix unsafe AD data parsing with bounds checks in central examples
- Fix UUID matching bugs (off-by-one loop condition and byte order) in
  phy_cent, htp_cent, and proximity_sensor_cent
- Fix ble_multi_conn_cent address type to use dynamic inference
- Remove contradictory sm_sc=0 after sm_sc=1 in ble_multi_adv
- Add CONFIG_BT_NIMBLE_EXT_ADV=y to ble_multi_adv sdkconfig defaults
- Check return values for ble_gap_set_host_feat, nimble_port_init
- Update tutorials and READMEs to match code changes

examples/bluetooth/nimble/ble_multi_adv/main/main.c

@@ -4,7 +4,6 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include "esp_log.h"
 #include "nvs_flash.h"
 
 /* BLE */
@@ -12,7 +11,6 @@
 #include "nimble/nimble_port_freertos.h"
 #include "host/ble_hs.h"
 #include "host/util/util.h"
-#include "console/console.h"
 #include "services/gap/ble_svc_gap.h"
 #include "multi_adv.h"
 
@@ -512,7 +510,6 @@ app_main(void)
     ble_hs_cfg.sm_bonding = 1;
     ble_hs_cfg.sm_mitm = 1;
     ble_hs_cfg.sm_sc = 1;
-    ble_hs_cfg.sm_sc = 0;
     /* Enable the appropriate bit masks to make sure the keys
      * that are needed are exchanged
      */