feat: Support Shoppable ads and v9 of mParticle iOS SDK

[BrandonStalnaker]

Summary

Adds selectShoppableAds for Shoppable Ads (JS/TS, Codegen, iOS; Android is a no-op). Migrates iOS to mParticle Apple SDK 9.0 (Rokt type renames, onEvent: pattern, config/builder updates). Bumps 3.0.0 and iOS 15.6. Fixes Expo prebuild (plugin transitive Rokt pods + dynamic framework list; podspec cleanup). Adds a short ExpoTestApp README guide and tweaks the demo (staging placement + attributes).

Testing Plan

Tested through MParticleExpoTest and confirmed shoppable ads displayed correctly.

Master Issue

Closes https://go.mparticle.com/work/REPLACEME

[cursor]

PR Summary

High Risk
High risk due to a major iOS SDK migration (API/type changes and event plumbing) plus raising the minimum iOS/tvOS versions, which can break builds or runtime behavior for existing consumers.

Overview
Adds a new Rokt API selectShoppableAds end-to-end (TS/JS wrapper + TurboModule codegen, iOS bridge implementation, and Android stubs that warn/no-op), and updates the Expo test app UI/docs to exercise the new flow.

Migrates the iOS implementation to mParticle Apple SDK 9.x (new ObjC module imports, RoktContracts event types, onEvent callback wiring, and RoktConfigBuilder-based config construction) while also raising minimum supported platforms to iOS/tvOS 15.6 and bumping the package to 3.0.0 (including peer RN >=0.76).

Updates the Expo config plugin and sample Podfile to dynamically link the expanded set of Rokt transitive pods, and tweaks CI/Trunk tooling (Node setup, Trunk Node runtime, ESLint/markdownlint pinning).

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