IOS SDK Rendering API supports Open Measurement for native format

[BaiShuoyang]

Is your feature request related to a problem? Please describe.
During OM certification for iOS SDK Rendering API native ads, we discovered that when we load the verification script for native, no OM SDK events are triggered.

Describe the solution you'd like
OM support for native ads for Rendering API.

Describe alternatives you've considered
None

Additional context
Technically and historically, the Native Ad unit is not a part of rendering API. It was introduced before Rendering API.
Adding the Rendering API, the committee decided to keep this implementation that doesn't have support of Open Measurement SDK. The implementation of Native Ads that supports OM was removed from the SDK in order to keep single Native API. Support of OM SDK for native was postponed. So Prebid SDK doesn't support OM for Native Ads.

[jsligh]

@YuriyVelichkoPI does this still need to be implemented?

[YuriyVelichkoPI]

Yes. OM is not supported in In-App Native integration.