feat: add airflow.roles value to manage FAB roles

[kmehkeri]

What issues does your PR fix?

Enables sync of FAB roles via values.yaml.

• fixes add support for specifying FAB roles (airflow.userRoles) #282

What does your PR do?

This PR adds a section .roles to values.yaml, which is read and processed by roles-sync job to add defined roles and permissions to FAB database. It's very similar to how users and variables are synced, except that it doesn't need templates.

Checklist

For all Pull Requests

• Commits are signed off
• Commits have semantic messages
• Documentation updated
• Passes ct linting

For releasing ONLY

• Chart.yaml version bumped
• CHANGELOG.md updated

[MrBones757]

Hello!

this implementation looks fairly complete; is there any ETA on when we might see this merged / released?

[afreyermuth98]

Will this PR would be merge some day ? It would be really useful ! cc @thesuperzapper