Replace old style type comments

[cdce8p]

Proposed change

Replace old style type comments for stream/core.py. I also noticed that the types probably won't work, since they don't correspond to any in PyAV/av/__init__.py. Instead they need to be imported from their respective packages.

Additionally AudioStream is only exported from av.audio.stream.AudioStream not av.audio.AudioStream. For a fix see: PyAV-Org/PyAV#775

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[probot-home-assistant]

Hey there @hunterjm, @uvjustin, @allenporter, mind taking a look at this pull request as its been labeled with an integration (stream) you are listed as a codeowner for? Thanks!
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[cdce8p]

I needed to revert the part for AudioStream due to a pylint error (c-extension-no-member). Will do the change once PyAV-Org/PyAV#775 is merged and the av dependency updated.