Add Interop for Native Ads

[robertjamison]

Google AdMob's Native Ads would be a great feature to enable for KMP, especially since it's so hard to work with already.

[mohamedsaber00]

Hi @robertjamison
I'm working on this, I can share with you the state I reached

[hidenobi]

Hi @robertjamison ,
I would like to ask if you have any plan for supporting AdMob native ads on Multiplatform, and if so, when do you think a trial version might be ready?

[robertjamison]

@hidenobi NativeAds is probably the toughest implementation to design. I was hoping to have a test version built in Q3 of this year, but it might get pushed to Q4.

[robertjamison]

This feature will be in beta starting v1.0.0-beta04.