[O2B-677] Add basic authentication to gRPC

[martinboulais]

I have a JIRA ticket

• [x] branch and/or PR name(s) include(s) JIRA ID
• [ ] issue has "Fix version" assigned
• [ ] issue "Status" is set to "In review"
• [x] PR labels are selected
• [ ] CHANGELOG.md and database/CHANGELOG.md files were updated