The type of this PR is: Chore

This PR resolves MX-463

Description

This disables tracking IDFA in Segment in preparation for new iOS 14 changes around its collection:
https://developer.apple.com/app-store/user-privacy-and-data-use/

Since we use ARAnalytics pod with the default segment provider this creates a custom subclass of the default Segment analytics provider with the only change being disabling this tracking on initialization.

Note: Segment is releasing an update sometime soon that removes this tracking code entirely and replaces it with a block based approach, we may want to update to that version when the time comes: segmentio/analytics-ios#892

PR Checklist (tick all before merging)

• I have included screenshots or videos to illustrate my changes, or I have not changed anything that impacts the UI.
• I have added tests for my changes, or my changes don't require testing, or I have included a link to a separate Jira ticket covering the tests. going to manually test at the end of related changes that analytics events are still coming through as expected
• I have documented any follow-up work that this PR will require, or it does not require any.
• I have added an app state migration, or my changes do not require one. (What are migrations?)