✨ Add support for the SHE Media ad network.

[mgriego]

Adds support for members of the SHE Media Partner Network to serve SHE Media ads on their AMP pages.

/cc @lannka @zhouyx

[mgriego]

Hey all,
I don't think the failed tests are related to my code. The saucelabs check failed trying to run a Firefox test:

[15:03:02] Firefox 70.0.0 (Windows 10.0.0): STARTED
[15:03:02] ERROR: Zero tests detected by Karma.
[15:03:02] {"startTime":1568818982951,"total":0,"success":0,"failed":0,"skipped":0,"totalTime":1,"netTime":0,"error":true,"disconnected":false}

The Percy test failed on some consent issues. These updates should not have affected any of the core consent logic, so I think the failure is unrelated to this PR.

[mgriego]

Rebased it on the current upstream master to see if that fixes the Percy test.

[mgriego]

@alanorozco Can you help with the tests here? I don't have permissions to restart the test jobs, and the Sauce Labs job is repeatedly failing with issues during the Firefox test.

[mrjoro]

/cc @ampproject/wg-ads

[mgriego]

/cc @calebcordry