Raw Throughput testing

This is the optional feature to test throughput over required transport layer (SPI or SDIO).
When ENABLED, this will bypass Wi-Fi traffic and push the dummy data traffic on transport layer directly to check maximum throughput on the current transport.
This feature will also help you to check if transport layer is properly configured or not.
This requires ESP firmware to be manually flashed with below steps.

Steps to test Raw TP

On Host side:
1. While setting up the host, pass rawtp argument to rpi_init.sh.
  - e.g if you are setting Wi-Fi over SDIO and you want to test raw TP over SDIO interface, then compile and load host driver as below:
```
$ cd esp_hosted_fg/host/linux/host_control/
$ ./rpi_init.sh sdio rawtp
```
On ESP side:
1. Go to esp_hosted_fg/esp/esp_driver/network_adapter/main/stats.h
2. Enable raw throughput tetsing feature by making TEST_RAW_TP value to 1.
3. There are two directions to test raw throughput and at a time, throughput can be tested only in one direction (simplex).
  - ESP to Host : For this, make TEST_RAW_TP__ESP_TO_HOST value to 1
  - Host to ESP : For this, make TEST_RAW_TP__ESP_TO_HOST value to 0
4. Build and flash ESP firmware again.

Note Please revert these configurations once raw throughput testing is done