feat: introduce promotional banner
This one adds a promotional banner for code suggestions
Related issue: #817 (closed)
Demo: https://www.youtube.com/watch?v=gSNpInFMqeU&ab_channel=GitLabUnfiltered
The banner is shown:
- if user has
gitlab.com
account: on first document change - if user does not have
gitlab.com
account: whengitlab.com
account is added
Edited by Illya Klymov