Merge Shopper Insights Feature Into Main

[agedd]

Summary of changes

• This PR merges the the Shopper Insights and MPE flow feature branch (payment-insights-feature) into main.

Checklist

• [x] Added a changelog entry

Authors

List GitHub usernames for everyone who contributed to this pull request.

• @agedd @scannillo

[jaxdesmarais]

Opened a PR with my suggestions here: https://github.com/braintree/braintree_ios/pull/1332