Sleep timer

[gadkins]

Summary

This issue adds timer logic the basic sleep/wake functionality implemented here.

The timers should be enforced at the platform level by tier. In this iteration, users will not have the option extend/disable the timers.

These should be the tier defaults:

• Starter Tier - 30 minutes
• Pro Tier - 3 hours
• Enterprise Tier - 6 hrs

Users can wake a sleeping cluster with uffizzi cluster wake. And uffizzi cluster sleep should force a cluster to sleep immediately no matter what the timer is (edited)

[gadkins]

Notes from @waveywaves :

We can start setting a default timer on the clusters
Install the operator on production and set the default timer to a week in the beginning
Then then user can manually wake the cluster if it is sleeping, it would be better to install the operator and just start using the timer in production, considering kubecon is around the corner as well

[moklidia]

We need to setup a webhook that would receive the information from the operator when a cluster is put to sleep.

UPD: no webhook for now

[moklidia]

Follow up ticket:

https://github.com/UffizziCloud/uffizzi_platform/issues/1256