Add some debug log for bt:

1. Add logs for SPP not enabled successfully
2. Add information to Applicatioin layer that the A2DP is connecting to peer device

Regular BTC and BTU Task name & Add BTC Init protection

1. Regular the BTC Task Name to Close a Github issue

   Closes https://github.com/espressif/esp-idf/issues/4966

2. Add BTC Init failure protection

3. Regular BTU Task Name with BTC

4. Correct the comment of
   a. SDP_ServiceSearchRequest and SDP_ServiceSearchRequest2
   b. l2cu_create_conn_after_switch

5. Correct comment of esp_bt_hf_vra();

6. Fix cpp compilier region

components/bt/host/bluedroid/api/include/api/esp_hf_ag_api.h

@@ -301,8 +301,8 @@ esp_err_t esp_bt_hf_disconnect_audio(esp_bd_addr_t remote_bda);
  * @brief           Response of Volume Recognition Command(AT+VRA) from HFP client. As a precondition to use this API,
  *                  Service Level Connection shall exist with HFP client.
  *
- * @param[in]       remote_bda: volume control target, speaker or microphone
- * @param[in]       value: gain of the speaker of microphone, ranges 0 to 15
+ * @param[in]       remote_bda: the device address of voice recognization initiator
+ * @param[in]       value: 0 - voice recognition disabled, 1- voice recognition enabled
  *
  * @return
  *                  - ESP_OK: disconnect request is sent to lower layer