Add "_when_accepted" block-data-on-consent value for <amp-ad>

[mlapeyre3]

Describe the new feature or change to an existing feature you'd like to see

Hello everyone! As part of a complex mechanism that needs two different adNetworks to deliver an <amp-ad>, I was looking for a way to:

• block networkA / allow networkB to send an ad request when the GDPR consent is negative/missing
• allow networkA / block networkB to send an ad request when the GDPR consent is positive To do so, the native support of something like <amp-ad data-block-on-consent="_when_accepted"> would be awesome.

Is it something that can be considered? Thanks!

Describe alternatives you've considered

So far, I tried to register the <amp-ad> with some custom .js code but it is naturally blocked by AMP. So I was thinking about the native support of data-block-on-consent

Additional context

The final setup would be

<amp-ad
    data-block-on-consent="_til_accepted"
    width="320"
    height="50"
    ...>
</amp-ad>

<amp-ad
    data-block-on-consent="_when_accepted"
    width="320"
    height="50"
    ...>
</amp-ad>

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