Feat: EXP-4851 - Add optimizely attribute fetch function #8

[patrick-wu]

Summary

Adding the following to the Rokt kit:

ingesting new settings field that indicates whether there's a onboardingExpProvider
new function for fetching optimizely experiments and transforming them to select-placement attributes
before selectPlacement(), executes the Optimizely attribute fetch function and attach Optimizely attributes to the SP call

Testing Plan

{explain how this has been tested, and what additional testing should be done}

[Copilot]

Pull Request Overview

This PR adds support for fetching Optimizely attributes and integrating them with the Rokt kit launch process.

• Adds a new settings field for the onboarding experiment provider.
• Introduces a new function (fetchOptimizely) to retrieve and transform active Optimizely experiments.
• Adds logging on the Rokt launcher attachment.