Add logic to refresh cached TENANTS every time interval

[michaelsogos]

If we want to add a new tenant "live" we should have a mechanism that refresh the cache.

It can be done with a simple setInterval() or thanks by the package https://github.com/miaowing/nest-schedule

In this way after an amount of time a new TENANT can be "accessible" with its own logins, and at the same time we don't have to shutdown the application.