Publish release as a verified publisher

[rhajek]

Client library is published on https://pub.dev/packages/influxdb_client under unverified uploader.

Publisher verification process described here: https://dart.dev/tools/pub/verified-publishers

[powersj]

Looks like we need to validate via a DNS record change that I will need to get help with creating. I was working through https://pub.dev/create-publisher