Harald Alvestrand 1f9e6046dd Start deprecation process for non-Optional datachannel parameters
The old version of these returns -1 when the value is not set.
Optional is better.

Bug: webrtc:42220231
Change-Id: Ideb0f51fd8bb7b5aa490743eb3b5d95998efbd1f
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/374483
Reviewed-by: Henrik Boström <hbos@webrtc.org>
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#43786}
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