esp_dbg_stubs_desc::min_stack_addr field

Pre-compiled target buffer's addr for stack. The size of the buffer is ESP_DBG_STUBS_STACK_MIN_SIZE. Target has the buffer which is used for the stack of onboard algorithms. If stack size required by algorithm exceeds ESP_DBG_STUBS_STACK_MIN_SIZE, it should be allocated using onboard function pointed by 'data_alloc' and freed by 'data_free'. They fit to the minimal stack. See below.