Support response based impression registration with AttributionSrc Url

[kuangyaz]

Description

Chrome proposed a new way for impression registration with the use of the AttribtionSrc Url (explainer).

With this proposal, we need to send a separate ping to fetch the attribution source for eligible traffic meeting the following conditions:

• attribution reporting is enabled
• there is ase=1 (attribution-source-enabled) Url param in the tracking Url

The new attribution source Url will be modified from the existing tracking Url by injecting the asr=1 (attribution-srouce-request) into it so that the recipient click servers can distinguish it.

Alternatives Considered

Successor of #35347

Additional Context

No response

[stale]

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