✨ [Extension AMP-AD] Implement feature to create a data vars slot id by unit when data-slot is entered

[kelvinbiffi]

The feature on this PR is to be able to create a data vars slot id by unit when data-slot is entered

I believe this feature is important to know the quantity os ad unit types have in one page on analytics trigger

psc @gurodrigues

[kelvinbiffi]

Hi @lannka
I implemented a simple feature to be able to identify the index of the amp-ad by slot units, could you have a look? =)

[kelvinbiffi]

Hi @lannka ,

Did you get a look?

Is there anything I need to do?

@calebcordry

[alanorozco]

@ampproject/wg-monetization

[kelvinbiffi]

Hi @powerivq

I made the changes you pointed, and I tried to create a 'macro' in amp-analytics consuming that attribute, however, I couldn't find a way to make it work correctly

Could you give me a clue about how could I create that macro?

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✅ EdmilsonSilva
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