Fix pylint issue with stream component c-extension

[cdce8p]

Proposed change

Follow up to #49103. av.audio.stream.AudioStream can be used as type if added to exclude list for pylint.

• Rename extension-pkg-whitelist setting to extension-pkg-allow-list. The former has been deprecated: http://pylint.pycqa.org/en/latest/technical_reference/features.html#general-options
• Add 'av.stream' and 'av.audio.stream' to extension-pkg-allow-list

For reference: PyAV-Org/PyAV#775

CC: @KapJI

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