Deprecate Universal Analytics July 2023

[MarkEdmondson1234]

Data won't be available for Universal Analytics properties past July 2023, or Jan 2024 for GA360. https://blog.google/products/marketingplatform/analytics/prepare-for-future-with-google-analytics-4/

So....the functions will need to be removed in favour of the new Data API. This issue will track it.

• [ ] Remove google_analytics()
• [ ] Remove segments etc.
• [ ] Update documentation
• [ ] Put deprecation notices on older functions
• [ ] Remove BigQuery functions and docs