I2I: Create a pbjs_global that would store pbjs globals on page

[mkendall07]

Type of issue

Feature

Description

Since renaming of the pbjs global is a supported feature, it would be nice if we had a reference on a page to what the global entry was.
Proposal: Store each pbjs global name in a pbjs_global array.
ex:

//create a pbjs global pointer
window.pbjs_global =  window.pbjs_global || [];
window.pbjs_global.push('$$PREBID_GLOBAL$$');

[stale]

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