[webrtc-encoded-transform] Improve security considerations for the script transform (#115)

youennf has just created a new issue for https://github.com/w3c/webrtc-encoded-transform:

== Improve security considerations for the script transform ==
As noted by @aboba:
> However, options might make sense where the processing is done in JS (e.g. to allow either SPacket or SFrame to be implemented in JS).  However, the status of the JS API should be clearly indicated and the limitations should be explained in a note and/or in the Security Considerations section (e.g. manual key management, keys exposed to JS, etc.).

Please view or discuss this issue at https://github.com/w3c/webrtc-encoded-transform/issues/115 using your GitHub account


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