esp_wifi_ftm_get_report() function

Get FTM measurements report copied into a user provided buffer. @attention 1. To get the FTM report, user first needs to allocate a buffer of size (sizeof(wifi_ftm_report_entry_t) * num_entries) where the API will fill up to num_entries valid FTM measurements in the buffer. Total number of entries can be found in the event WIFI_EVENT_FTM_REPORT as ftm_report_num_entries @attention 2. The internal FTM report is freed upon use of this API which means the API can only be used once after every FTM session initiated @attention 3. Passing the buffer as NULL merely frees the FTM report