import GatewayConnector fails with no event loop

I am trying to import Gateway in a separate thread and it fails with:
```
Traceback (most recent call last):
File "", line 883, in exec_module
File "", line 241, in _call_with_frames_removed
File "/exos/loop_error.py", line 3, in
from dask_gateway import Gateway, GatewayCluster
File "/usr/local/lib/python3.10/site-packages/dask_gateway/__init__.py", line 5, in
from .client import (
File "/usr/local/lib/python3.10/site-packages/dask_gateway/client.py", line 25, in
from . import comm
File "/usr/local/lib/python3.10/site-packages/dask_gateway/comm.py", line 29, in
class GatewayConnector(Connector):
File "/usr/local/lib/python3.10/site-packages/dask_gateway/comm.py", line 31, in GatewayConnector
_resolver = netutil.ExecutorResolver(close_executor=False, executor=_executor)
File "/usr/local/lib/python3.10/site-packages/tornado/util.py", line 288, in __new__
instance.initialize(*args, **init_kwargs)
File "/usr/local/lib/python3.10/site-packages/tornado/netutil.py", line 427, in initialize
self.io_loop = IOLoop.current()
File "/usr/local/lib/python3.10/site-packages/tornado/ioloop.py", line 263, in current
loop = asyncio.get_event_loop()
File "/usr/local/lib/python3.10/asyncio/events.py", line 656, in get_event_loop
raise RuntimeError('There is no current event loop in thread %r.'
RuntimeError: There is no current event loop in thread 'AnyIO worker thread'.
```
Issue related to GatewayConnector initialisation:
```
class GatewayConnector(Connector):
_executor = ThreadPoolExecutor(2)
_resolver = netutil.ExecutorResolver(close_executor=False, executor=_executor)
...
```
`ExecutorResolver` tries to `IOLoop.current()` and fails.

Is it possible to release the fix and don't call `IOLoop.current()` on import?

Versions:
dask-gateway==2022.6.1