Create selectmedia.js

[ronen-smg]

trafficstars

3p integration for selectmedia

[erwinmombay]

@calebcordry @powerivq could any of y'all take a look at this?

[powerivq]

I think you would also need to modify ads/_config.js and add a new vendor js in ads/vendors/selectmedia.js

[stale[bot]]

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