Network Services | udp: port tx & rx udp tests to net-services (!37)

[Prithvi Tambewagh (@prithvi77)]

Prithvi Tambewagh created a merge request: https://gitlab.rtems.org/rtems/pkg/rtems-net-services/-/merge_requests/37

Project:Branches: prithvi77/rtems-net-services:lwIP-test-netservices-port to rtems/pkg/rtems-net-services:main
Author:   Prithvi Tambewagh



## Summary

This MR moves the tests developed during GSoC 25 project: 

* TX UDP Test: https://gitlab.rtems.org/prithvi77/rtems-lwip/-/blob/f3df15c3c6947c2a3841205d4a97bbf4464ed9a6/rtemslwip/test/tx_udp/init.c
* RX UDP Test: https://gitlab.rtems.org/prithvi77/rtems-lwip/-/blob/f3df15c3c6947c2a3841205d4a97bbf4464ed9a6/rtemslwip/test/rx_udp/init.c

with the following modifications:

- Remove IP address printing functions to keep test minimalistic
- Use ipaddr_addr() instead of inet_addr()
- Improve debug log for formatting & consistency
- Use net_start() to setup network according to configuration in net_adapter.c and rtems_shell_init() to start the RTEMS shell session
- Set CONFIGURE_MAXIMUM_USER_EXTENSIONS to 1 to facilitate runtime user extension creation by rtems_bsd_compat_initialize()
- Remove 1s delay in rx_udp test which was present while receiving messages
- Note: The tests have currently been tested with GRETH lwIP driver, with which they work alright.

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