Allow assignment of readonly user either via SCIM provisioning or via API integration instead of email invitation

[khurram-mahmood-vgw]

Is your feature request related to a problem? Please describe.
When using SSO integration, users logging in to Testomat via Okta SSO, a user license gets assigned. If the user has been invited as a Readonly user previously, when they next log in via Okta, they are assigned a license and no longer remain readonly.

Describe the solution you'd like
We would like the ability either to utilise SCIM provisioning where permissions/roles can be set inside the Testomat application and will then replicate back into the SSO platform, or if we can assign license along with role/permissions via API integration. This is required to allow enterprise level functionality

Describe alternatives you've considered
None available outside of manual user assignment - breaks SSO

Additional context
Discussed with @DavertMik