chore: Add MPRoktLayout Implementation to Example App

[BrandonStalnaker]

Background

• The mParticle iOS SDK supports Rokt integration for displaying placements, but the SwiftExample app was missing a demonstration of the MPRoktLayout SwiftUI component, which provides a declarative approach to integrating Rokt placements as documented at Rokt iOS SDK Integration Guide
• Additionally, the example app lacked a demonstration of the events:onEvent: subscription API for handling Rokt placement lifecycle events

What Has Changed

• Added a new function selectPlacementWithEventSubscription() demonstrating the imperative rokt.events() API with MPRoktEvent handling
• Added mParticle_Rokt_Swift and Rokt_Widget imports to ContentView.swift to access the SwiftUI layout component and Rokt SDK types
• Created RoktLayoutExampleView, a new SwiftUI view demonstrating:
• Using MPRoktLayout with sdkTriggered binding for declarative placement control
• Configuring placements with RoktConfig (color mode, caching)
• Handling all RoktEvent types (PlacementReady, PlacementInteractive, OfferEngagement, PositiveEngagement, PlacementClosed, etc.)
• Real-time event logging to visualize the placement lifecycle

Checklist

• I have performed a self-review of my own code.
• I have tested this locally.

Reference Issue (For employees only. Ignore if you are an outside contributor)

• Closes https://go/j/[ticket-number]

[github-actions]

📦 SDK Size Impact Report

Measures how much the SDK adds to an app's size (with-SDK minus without-SDK).

Metric	Target Branch	This PR	Change
App Bundle Impact	1.82 MB	1.82 MB	+N/A
Executable Impact	896 bytes	896 bytes	+N/A
XCFramework Size	9.49 MB	9.49 MB	+N/A

➡️ SDK size impact change is minimal.

Raw measurements

Target branch (main):

{"baseline_app_size_kb":84,"baseline_executable_size_bytes":75464,"with_sdk_app_size_kb":1944,"with_sdk_executable_size_bytes":76360,"sdk_impact_kb":1860,"sdk_executable_impact_bytes":896,"xcframework_size_kb":9716}

This PR:

{"baseline_app_size_kb":84,"baseline_executable_size_bytes":75464,"with_sdk_app_size_kb":1944,"with_sdk_executable_size_bytes":76360,"sdk_impact_kb":1860,"sdk_executable_impact_bytes":896,"xcframework_size_kb":9716}

[nickolas-dimitrakas]

LGTM