Added oceanfx support for pyseabreeze over ipv4

[denis97]

Now oceanfx is supported with pyseabreeze api when connected over ethernet.

Code example used to check basic functionality:

import seabreeze.pyseabreeze
from seabreeze.spectrometers import Spectrometer

sbapi=seabreeze.pyseabreeze.SeaBreezeAPI()
seabreeze.use('pyseabreeze')

sbapi.add_ipv4_device_location(device_type="FX", ip_address="127.0.0.1", port=1234)
dev=sbapi.list_devices()[0]
spec = Spectrometer(dev)

spectrum= spec.spectrum()

[ap--]

Thank you for your contribution ❤️

I fixed the mypy issue and will merge once tests pass

[denis97]

Thank you for providing this tool! 😄