[Bug] Reconnection on ThreadX causes crash due to memset()

[ben5049]

Describe the bug

ThreadX's threads, mutexes etc contain pointers to the next and previous thread, mutex etc, forming a linked list. When Zenoh Pico attempts to reconnect it uses memset() to zero these structs rather than deleting them properly. This leads to ThreadX attempting to dereference zeroed memory when going through the linked list, causing the program to crash. An example of this is at the start of the function _z_unicast_transport_create.

To reproduce

1. Run any ThreadX example with Z_FEATURE_AUTO_RECONNECT = 1
2. Start an instance of zenohd
3. Stop zenohd
4. Start zenohd again
5. Zenoh pico will crash due to ThreadX attempting to dereference uninitialised memory

System info

• Platform: STM32H573, ThreadX, NetXduo