[webrtc-pc] Handling of duplicate rids in sRD seems underspecified (#2780)

docfaraday has just created a new issue for https://github.com/w3c/webrtc-pc:

== Handling of duplicate rids in sRD seems underspecified ==
For example, a=simulcast:recv foo;foo

While this is pretty silly, I don't see anything in RFC 8853 that forbids it. I see two reasonable options:

1. Ignore any duplicates.
2. Fail the sRD, probably with an InvalidAccessError.

I think I prefer option 1. We might want to consider consistency with #2769 

Please view or discuss this issue at https://github.com/w3c/webrtc-pc/issues/2780 using your GitHub account


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