Multi-tenant : user can select the tenant he is on

[fdonnet]

For the moment, the current Tenant is retrived from the user claims from Keycloak (in a list).

But the first tenantid in the array is selected as the current tenant.

Need to implements something better and the possibility for the user to select his default tenant and the current one.

[fdonnet]

Some progress on that. The app support multi tenants. Issue will be closed when the final app user can switch and change tenant on demand.