Setup GDB Server for AMF Remote Debugging

[pranav-kumar-hex]

As part of improving developer onboarding and debugging capabilities for the UnifyAir 5G core project, we need to enable remote debugging of the AMF (Access and Mobility Management Function) using the GDB server.

To do this just create a temp image and install gdbserver and add appropriate hooks for starting of AMF ?

This will significantly improve the debugging experience, especially when working with the containerised integration testing environment from PR #5.