[WEB ROOT PROCEDURE] - Add ymodem

[simonebortolin]

With some huawei MA5671A vodafone IT step 2 fails as there is no rootfs_data with committed image1.

ymodem should be implemented to flash images, like: https://github.com/ganioc/ymodem-sender-js.

Some steps are still to be investigated, but the idea is:

1. Add ymodem (you have to find out how to import it and whether webpack is required)
2. If step 2 fails an additional step is created that flashes the flash, since the transfer is slow, about 15 minutes, it is necessary to warn the user and implement a progress bar.

So the steps for implementation are:

• include ymodem.
• include progress bar in JTD.
• test ymodem.
• implements the logic of flash.

for the implementation of the first two points will come soon (mid-jan-23).