1200: POC for WithMirror transport

[sherine-k]

This is my first PR to this repository.

This PR doesn't aim to fix #1200 (yet) : This is just an initial attempt to do so.

I'm submitting this in order to initiate the discussion started in #1200 around the implementation, and acknowledge that:

• I wasn't able to successfully run ./hack/presubmit.sh: It complains about absence of cmp and cpu under the internal folder
• I didn't implement any unit tests so far, but will do so after we validate together the direction for this PR
• Some things are still hard coded, and I need to fix those things after getting a green light for continuing

Thanks for the opportunity, and looking forward to contributing

[mepi262]

@jonjohnsonjr @mattmoor @imjasonh cc @sherine-k
The reviewee wants to discuss this pull request. With Whom is it appropriate to discuss it?

[github-actions]

This Pull Request is stale because it has been open for 90 days with
no activity. It will automatically close after 30 more days of
inactivity. Keep fresh with the 'lifecycle/frozen' label.

[deitch]

This would be great to have. Got to be rebased, and have a maintainer review it.

[mepi262]

@sherine-k
It seems that some checks are not working.
This stackoverflow may help you.
https://stackoverflow.com/questions/52200096/github-pull-request-waiting-for-status-to-be-reported

[sherine-k]

closing temporarily and reopening to trigger GH actions

[sherine-k]

/azp run