feat: rewarded ad sample app

[peterporfy]

Adds a new adsTester sample app, which will potentially gain more ad related examples. First, I added it to the existing tester app, but it would have required multiple changes and extra dependencies which are probably not that relevant for most of the users, so I thought it is cleaner to have it separately for now.

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Note

Low Risk
Changes are confined to a new example app and CI wiring; no production SDK or library code paths are modified.

Overview
Adds a new examples/adsTester React Native app that demonstrates RevenueCat’s rewarded-ad reward verification flow end to end with AdMob (react-native-google-mobile-ads), separate from the main purchase tester examples.

The sample wires generateRewardVerificationToken → AdMob serverSideVerificationOptions → pollRewardVerification on EARNED_REWARD, with test AdMob IDs and a placeholder API key. react-native-purchases is resolved from repo src via Babel/Metro/react-native.config.js (same pattern as purchaseTesterTypescript), not as an npm dependency.

CircleCI gains adstester_ios and adstester_android jobs (root + example yarn install, Metro bundle, typecheck/lint on Android, native debug builds) and both are registered on the main build-test-hold-deploy workflow.

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[peterporfy]

• feat: rewarded ad sample app #1897 👈 (View in Graphite)
• main

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[RevenueCat-Danger-Bot]

	2 Warnings
⚠️	Size check is being bypassed due to the presence of the label "danger-bypass-size-limit"
⚠️	Size increase: 455.69 KB

Generated by 🚫 Danger

[AlvaroBrey]

Only a light review for this one since it's huge 🙃

Beside the below comments, please add CI for this. Ideally build both platforms on separate jobs, plus yarn build/lint

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[peterporfy]

@AlvaroBrey I've added a circleci config based on the expo example app

[AlvaroBrey]

Danger is failing because of PR size, you can just add the label suggested in the message in this case. You may need to rebase or push something so that Danger picks it up

Thanks for addressing the feedback! 🚢