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This CL adds the readable and writable fields to the
RTCInsertableStreams dictionary.
These are equivalent to and will replace readableStream and writableStream.
The reason for this is consistency with other APIs that use stream pairs.

Drive-by: rename RTCCodedVideoFrameType to RTCEncodedVideoFrameType to
match the spec and update tests to comply with other API changes.

Bug: 1119653
Change-Id: I64bcafb2602fb952722f1845abaeebd09f3e77d3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2366592Reviewed-by: Harald Alvestrand <hta@chromium.org>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800032}