feat: Alternative Ophan Implementation

[jimhunty]

Why are you doing this?

Previously we had a native implementation for Ophan. This was built using the native libraries with a Multiplatform Kotlin wrapper. However, this had performance issues and become unmaintained.

We have since attempted to use the Ophan npm library, however, this requires the document object which is not available in React Native as its not a web browser bases solution

As a result, we have dissected the endpoints used on theGuardian.com and made an attempt to replicate from inspecting the network console.

Changes

• Ophan service is from the previous removal (chore: Remove Ophan #2206) but tweaked to work with the endpoint
• Added packages to polyfill the missing crypto library so we can provide a unique identified for viewId
• Ophan returns to being a required service and therefore we require users to accept the privacy settings again

[groakland]

LGTM