Add support for live truTV streams

[ischmidt20]

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Description of your pull request and other information

Adds support to the tbs extractor for live truTV streams (e.g., https://www.trutv.com/watchtrutv/east). To be honest, this might belong in the separate truTV extractor, but as the TNT live streams were already here, it was easier for me to follow along to add truTV.

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• Fix or improvement to an extractor (Make sure to add/update tests)
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[pukkandan]

Is there an open issue for this? And pls add a test

[ischmidt20]

No open issue, I just noticed it myself because truTV follows same format as TBS and TNT but extractor was only set up to handle TBS/TNT. Adding test shortly

[bashonly]

It looks like truTV has adopted the same backend and URL format as TBS/TNT for its episodes and clips as well. The other extractor in trutv.py is obsolete: there is no way to find URLs on the trutv website that are matched by the old extractor; however, the old API seems to be still operational in a legacy capacity and thus the old extractor's test still works.

It's probably not necessary to remove the old trutv extractor yet, but perhaps we should add a comment to clarify its situation. And we should probably return _old_archive_ids in the TBS extractor if site == trutv since the video IDs appear to be the same as before