add verified_type user field

[igorbrigadir]

https://twitter.com/suhemparack/status/1611085481395224576

1. Tweet view count is available as impression_count under public_metrics
2. source field is removed from the API
3. verified_type is supported a user field to indicate account verification type (business, government, blue or none)

Keeping the source field however, as this needs to be backward compatible. public_metrics is there already, so it doesn't need changing, and impressions are visible from Dec 15th 2022 for the record.