Add HLS m3u8 test streaming video file

[jmagman]

Add a HTTP Live Streaming (HLS) .m3u8 file to test in the video_player plugin flutter/flutter#97206

Created from the existing bee.mp4 video:

$ ffmpeg -i bee.mp4 -g 60 -hls_time 2 -hls_list_size 0 -hls_segment_size 500000 bee.m3u8

Pre-launch Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I read the Tree Hygiene wiki page, which explains my responsibilities.
• I read the Flutter Style Guide recently, and have followed its advice.
• I signed the CLA.
• I listed at least one issue that this PR fixes in the description above.
• I updated/added relevant documentation (doc comments with ///).
• I added new tests to check the change I am making, or this PR is test-exempt.
• All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel on Discord.

[IlyaMax]

It would be useful to add longer video to example to test issues with video_player in bad internet condition. At least 2 minutes if it possible so buffer couldn't fill up. I'm going to contribute with this in flutter/plugins#4693

[jmagman]

It would be useful to add longer video to example to test issues with video_player in bad internet condition. At least 2 minutes if it possible so buffer couldn't fill up. I'm going to contribute with this in flutter/plugins#4693

Is there some reason that needs to be HLS and not mp4 or other video format?

[stuartmorgan-g]

We recently switched webview_flutter tests from external URLs to an in-test web server. That's the way we should be moving with video_player as well (it just hasn't been done yet) so more complex use cases like really slow loading should be done via a test server rather than adding more complex assets here.

[stuartmorgan-g]

LGTM