Add openh264 extension
We should add the openh264 extension here, but there are concerns blocking getting this merged right now. In particular the following discussion on versioning:
The following discussion from !1638 (merged) should be addressed:
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@ramcq started a discussion: (+3 comments) Do we also want to consider versioning the extension differently to the runtime? Like 2.0 so that it only exists once per major ABI version of OpenH264? A future runtime would not need another copy of the binary to be fetched onto the system if it was the same OH264 ABI.