[interactive_media_ads] Updates ProxyApis to prepare to add support for AdEvent.ad

[bparrishMines]

Pre-Review Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
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• I read and followed the relevant style guides and ran the auto-formatter.
• I signed the CLA.
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• I linked to at least one issue that this PR fixes in the description above.
• I updated pubspec.yaml with an appropriate new version according to the pub versioning philosophy, or I have commented below to indicate which version change exemption this PR falls under¹.
• I updated CHANGELOG.md to add a description of the change, following repository CHANGELOG style, or I have commented below to indicate which CHANGELOG exemption this PR falls under¹.
• I updated/added any relevant documentation (doc comments with ///).
• I added new tests to check the change I am making, or I have commented below to indicate which test exemption this PR falls under¹.
• All existing and new tests are passing.

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[gemini-code-assist]

Code Review

This pull request adds internal wrappers for the iOS native IMAAd and IMAUniversalAdID classes, which is a good step forward. The changes include new pigeon definitions, generated code for Dart and Swift, native delegate implementations, and new tests.

However, there are a few critical issues to address:

• The pull request description is the default template and hasn't been filled out. Please update it to describe the changes and link to the relevant issue(s), as required by the contributor guide.
• There are inconsistencies in the implementation. Some delegate methods in AdProxyAPIDelegate.swift are commented out, but the generated code calls them with force unwrapping (try!), which will lead to a runtime crash.
• A test case for companion ads is commented out in AdProxyAPITests.swift, which should be enabled to ensure full test coverage for the newly supported feature.

Please address these points to ensure the stability and completeness of the changes.

[gemini-code-assist]

This method is commented out, but the generated pigeon code in InteractiveMediaAdsLibrary.g.swift calls it using try!. This will cause a runtime crash when a new IMAAd instance is created. Please uncomment and implement this method.

Suggested change

	// func adPodInfo(pigeonApi: PigeonApiIMAAd, pigeonInstance: IMAAd) throws -> IMAAdPodInfo {
	// return pigeonInstance.adPodInfo
	// }
	func adPodInfo(pigeonApi: PigeonApiIMAAd, pigeonInstance: IMAAd) throws -> IMAAdPodInfo {
	return pigeonInstance.adPodInfo
	}

[gemini-code-assist]

This method is commented out, but the generated pigeon code in InteractiveMediaAdsLibrary.g.swift calls it using try!. This will cause a runtime crash when a new IMAAd instance is created. Please uncomment and implement this method.

Suggested change

	// func universalAdIDs(pigeonApi: PigeonApiIMAAd, pigeonInstance: IMAAd) throws -> [IMAUniversalAdID] {
	// return pigeonInstance.universalAdIDs
	// }
	func universalAdIDs(pigeonApi: PigeonApiIMAAd, pigeonInstance: IMAAd) throws -> [IMAUniversalAdID] {
	return pigeonInstance.universalAdIDs
	}

[gemini-code-assist]

This test case for companionAds is commented out. Since the README.md has been updated to remove companion ads from the list of unsupported features, this test should be enabled to ensure the functionality is correctly implemented and verified.

Suggested change

	// func testCompanionAds() {
	// let registrar = TestProxyApiRegistrar()
	// let api = registrar.apiDelegate.pigeonApiIMAAd(registrar)
	//
	// let instance = TestAd.customInit()
	// let value = try? api.pigeonDelegate.companionAds(pigeonApi: api, pigeonInstance: instance)
	//
	// XCTAssertEqual(value, instance.companionAds)
	// }
	func testCompanionAds() {
	let registrar = TestProxyApiRegistrar()
	let api = registrar.apiDelegate.pigeonApiIMAAd(registrar)
	let instance = TestAd.customInit()
	let value = try? api.pigeonDelegate.companionAds(pigeonApi: api, pigeonInstance: instance)
	XCTAssertEqual(value, instance.companionAds)
	}

[bparrishMines]

/gemini review

[gemini-code-assist]

Code Review

This pull request prepares for adding support for AdEvent.ad by updating the native ProxyAPIs. It introduces new classes for IMAAd and IMAUniversalAdID on iOS, and updates AdEvent on both Android and iOS to include the ad property. The changes are well-implemented, with corresponding updates to pigeon files, native code, tests, and package metadata. The refactoring of some iOS pigeon classes to extend NSObject improves consistency. I have one suggestion to improve the implementation of the uiElements function for better readability and maintainability.

[gemini-code-assist]

The implementation of this function is a bit verbose and can be simplified using a more functional approach with map. This would make the code more concise and arguably easier to read by reducing repetition.

    let uiElementsArray = pigeonInstance.uiElements as NSArray
    // IMAAd.uiElements is expected to be NSArray<NSNumber *>, but is returning as
    // an NSArray<NSString *> and causing a crash when using Swift. This attempts
    // to handle both scenarios and returns UIElementType.unknown if the value
    // can't be handled.
    return uiElementsArray.map { uiElement -> UIElementType in
      if let stringValue = uiElement as? String {
        switch stringValue {
        case "adAttribution":
          return .adAttribution
        case "countdown":
          return .countdown
        default:
          return .unknown
        }
      } else if let numberValue = uiElement as? NSNumber,
        let type = IMAUiElementType(rawValue: numberValue.intValue)
      {
        switch type {
        case .elements_AD_ATTRIBUTION:
          return .adAttribution
        case .elements_COUNTDOWN:
          return .countdown
        default:
          return .unknown
        }
      }
      return .unknown
    }