feat: Add Device Identifiers to Attributes and Fix Mapping

[BrandonStalnaker]

Summary

• This PR enhances the Rokt Kit integration by adding device identifiers (IDFA/IDFV) to placement attributes and fixes the attribute mapping configuration access.

Changes

Device Identifiers

• Added idfa and idfv attributes sourced directly from filteredUser.idfa and filteredUser.idfv
• IDFA is only populated when ATT (App Tracking Transparency) authorization has been granted
• Moved MPID assignment into addIdentityAttributes method for better organization

Configuration Access Fix

• Fixed attribute mapping configuration access to use the correct nested path: roktKitConfig["as"]["placementAttributesMapping"]
• Fixed hashed email identity type configuration access to use: roktKitConfig["as"]["hashedEmailUserIdentityType"]

Code Quality Improvements

• Introduced constants for configuration keys (kMPKitConfigurationIdKey, kMPRemoteConfigKitConfigurationKey, etc.)
• Replaced hardcoded strings with constants throughout (kMPRoktAttributeKeySandbox, kMPRoktIdentityTypeIdfa, etc.)
• Added comprehensive documentation to public methods
• Improved logging messages for better debugging

Testing Plan

• Was this tested locally? If not, explain why.

Tests will fail until new binary of core sdk is released
Added 6 new unit tests covering:

• Device identifiers (IDFA/IDFV) being added correctly
• Nil IDFA handling (ATT not authorized)
• Nil IDFV handling
• Both device identifiers nil
• Device identifiers coexisting with user identity identifiers (idfa/idfv vs ios_idfa/ios_idfv)
• Nil userId/MPID handling

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

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

[nickolas-dimitrakas]

LGTM

[samdozor]

let's not ship this

[BrandonStalnaker]

@samdozor I have quite a few other improvements included in this PR. I'm assuming your comment is in reference to the code sdding MPID, IDFA, and IDFV to the attributes being passed to the Rokt SDK? If you could confirm that I'd like to remove that code and just rename the commit on merge.