The r1003 build includes png encoder, image2 muxer, webm demuxer
and decoder. These will be used to split webm videos
into frame sequences.
This increases Playwright package size from 6.7MB to 7.1MB
This patch:
- moves ffmpeg binaries from `//bin/` to `//third_party/ffmpeg`
- adds [COPYING.GPLv3](https://github.com/FFmpeg/FFmpeg/blob/master/COPYING.GPLv3)
ffmpeg license
- changes npm packaging to include `//third_party/ffmpeg` only in `playwright` and `playwrihgt-chromium` a