Harald Alvestrand 8d4a5f1122 Add an async DNS resolver suitable for defaulting.
This should replace the wrapping async DNS resolver used
for default resolution.

Bug: webrtc:12598
Change-Id: Ic65ecd17da7a5695d0003178aeb30824a707ec78
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/316928
Reviewed-by: Tomas Gunnarsson <tommi@webrtc.org>
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#40607}
2023-08-23 10:08:52 +00:00
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