Wifi UDP class and Begin function

[IFX-Anusha]

This PR contains the

• WiFi UDP class implementation with dummy function implementation
• UDP.begin() function implementation
• Test case structure is added
• Test for the begin function

Note :- Test case structure can be later modified according to the requirements

I have created a branch for the UDP class and will be opening the PR to this branch for the UDP class functions

[jaenrig-ifx]

Looking good so far.
I think adapting the socket class to extend for UDP sockets should make the implementation of this class quicker and easier.
And a lot is already implemented on the socket class reusable by the UDP socket, interrupts, buffers, etc.

[jaenrig-ifx]

The Socket class is already there. Shouldn´t we extend it for UPD?
When UDP we use recvFrom() and sendTo() instead of recv() and send(). The create() gets different arguments but many other things would be reusable.
And other functions are simply not used for UDP.
https://github.com/Infineon/mtb-example-wifi-udp-client/blob/master/source/udp_client.c
https://github.com/Infineon/mtb-example-threadx-wifi-udp-server/blob/master/udp_server.c

[jaenrig-ifx]

Nice :) 👍