feat(test-framework): Add a test-framework to bao

[miguelafsilva5]

PR Description

This PR integrates a test framework into bao-hypervisor. This is done by adding 2 submodules:

• bao-tests : This repo contains the python scripts responsible for building the system, connect to the board under test, and log the test results. It also contains the C code required to declare and implement tests.
• bao-nix : This repo is comprised of several nix packages used to build the whole system stack (toolchains, firmware, bao, guests, etc)

Furthermore, this PR includes a directory dedicated to the implementation of test setups (recipes).
More info on how to use is available in tests/README.md.

This PR is currently working for qemu-aarch64-virt and qemu-riscv64-virt

[miguelafsilva5]

@Diogo21Costa is it possible to run the framework on the docker like we do with the CI? With the CI we do, for example:
make -C ci/docker format
It would be be nice if we could do something along those lines:
make tests/docker PLATFORM=plat RECIPE=recipe
Without having to open the docker command line and run the commands from there.

[miguelafsilva5]

@Diogo21Costa I've been testing the TF following the readme with docker. Only qemu-aarch64-virt and qemu-riscv64-virt worked.
I'm leaving my dumps
fvp-a:

Traceback (most recent call last):
  File "/home/mafs/TF/bao-hypervisor/tests/bao-tests/framework/test_framework.py", line 416, in <module>
    deploy_test(platfrm, args.gicv, guest_os,
  File "/home/mafs/TF/bao-hypervisor/tests/bao-tests/framework/test_framework.py", line 313, in deploy_test
    logger.connect_to_platform_port(diff_ports, args.echo)
  File "/home/mafs/TF/bao-hypervisor/tests/bao-tests/framework/connection.py", line 157, in connect_to_platform_port
    self.open_connection(port)
  File "/home/mafs/TF/bao-hypervisor/tests/bao-tests/framework/connection.py", line 255, in open_connection
    ser = serial.Serial(port_name,
          ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/b01lghv79qpiz96zdifyi8hiix798c0g-python3.11-pyserial-3.5/lib/python3.11/site-packages/serial/serialutil.py", line 244, in __init__
    self.open()
  File "/nix/store/b01lghv79qpiz96zdifyi8hiix798c0g-python3.11-pyserial-3.5/lib/python3.11/site-packages/serial/serialposix.py", line 325, in open
    raise SerialException(msg.errno, "could not open port {}: {}".format(self._port, msg))
serial.serialutil.SerialException: [Errno 5] could not open port /dev/pts/1: [Errno 5] Input/output error: '/dev/pts/1'
make: *** [/home/mafs/TF/bao-hypervisor/tests/tests.mk:38: framework] Error 1

fvp-r:

Traceback (most recent call last):
  File "/home/mafs/TF/bao-hypervisor/tests/bao-tests/framework/test_framework.py", line 416, in <module>
    deploy_test(platfrm, args.gicv, guest_os,
  File "/home/mafs/TF/bao-hypervisor/tests/bao-tests/framework/test_framework.py", line 268, in deploy_test
    vm_regions = extract_vm_regions(config_file_path)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/mafs/TF/bao-hypervisor/tests/bao-tests/framework/test_framework.py", line 212, in extract_vm_regions
    with open(config_file_path, encoding="utf-8") as file_handle:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: '/home/mafs/TF/bao-hypervisor/tests/recipes/configs/fvp-r.c'
make: *** [/home/mafs/TF/bao-hypervisor/tests/tests.mk:38: framework] Error 1

[miguelafsilva5]

Nix recipes should also be up to date according to bao-demos/update/misc