Silo cert CRUD support

[benjaminleonard]

Currently available in the API, CLI but not Console

[askfongjojo]

Not a high priority item but want to put this in a more visible backlog if there is any bandwidth between major feature work. Feel free to re-target it to a future release.

[askfongjojo]

I swear that I have tried to look for a ticket about TLS cert before making a dup ticket (again). One thing that may be useful to capture from the dup is:

If it's not hard to do, it'll be helpful to display the expiration dates of the existing certs (totally a nice-to-have).