[Bug] Added asyncio due to virustotal_public module issue

[lydionLuna]

Hi,

I've encountered the following issue when using the virustotal_public module:

  File "/home/misp-modules/.local/lib/python3.11/site-packages/misp_modules/__init__.py", line 223, in post
    response = yield tornado.gen.with_timeout(timeout, future)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/misp-modules/.local/lib/python3.11/site-packages/tornado/gen.py", line 766, in run
    value = future.result()
            ^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.11/concurrent/futures/thread.py", line 58, in run
    result = self.fn(*self.args, **self.kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/misp-modules/.local/lib/python3.11/site-packages/misp_modules/__init__.py", line 210, in run_request
    response = module.handler(q=json_payload)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/misp-modules/.local/lib/python3.11/site-packages/misp_modules/modules/expansion/virustotal_public.py", line 242, in handler
    client = vt.Client(request['config']['apikey'],
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/misp-modules/.local/lib/python3.11/site-packages/vt/client.py", line 241, in __init__
    self._connector = aiohttp.TCPConnector(ssl=self._verify_ssl)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/misp-modules/.local/lib/python3.11/site-packages/aiohttp/connector.py", line 776, in __init__
    super().__init__(
  File "/home/misp-modules/.local/lib/python3.11/site-packages/aiohttp/connector.py", line 232, in __init__
    loop = get_running_loop(loop)
           ^^^^^^^^^^^^^^^^^^^^^^
  File "/home/misp-modules/.local/lib/python3.11/site-packages/aiohttp/helpers.py", line 300, in get_running_loop
    loop = asyncio.get_event_loop()
           ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.11/asyncio/events.py", line 681, in get_event_loop
    raise RuntimeError('There is no current event loop in thread %r.'
RuntimeError: There is no current event loop in thread 'ThreadPoolExecutor-0_0'.

The issue seems to stem from vt.Client which runs asynchronously causing the misp virustotal_public module to fail as there is no event loop in the thread. In my current environment, I've added the following inside the virustotal_public handler as a temporary fix:

    import asyncio
    try:
        asyncio.get_running_loop()
    except RuntimeError:
        asyncio.set_event_loop(asyncio.new_event_loop())

Ref: #726

[adulau]

Thank you very much!