Google: Performance Max campaign creation

What we're asking for: support Performance Max on POST /v1/ads/create, e.g. campaignType "pmax" with an asset-group shaped payload.

Why this matters to us: PMax is the campaign type Google actively steers small advertisers toward, and it's the one that performs reasonably with very little hands-on management - which is exactly what a plumber or a bookkeeper needs. Today campaignType accepts search|display only, so through your API we can only offer the two types that
demand the most ongoing attention, while the type built for our audience is out of reach.

What happens today: no PMax support on create; campaignType is limited to search and display.

What "done" looks like for us: create a PMax campaign with an asset group (headlines, long headline, descriptions, landscape/square images, logo, optional video), a budget, geo targeting and a final URL; read the asset group back; and control the campaign status the same way as other campaign types (ideally created paused).