Add Support for objectstore_credentials_show.go

[uzaxirr]

[alejandrojnm]

If I pass an invalid name or ID, return not found, a nice message @alessandroargentieri Do you agree ??

[uzaxirr]

If I pass an invalid name or ID, return not found, a nice message @alessandroargentieri Do you agree ??

something like this?

[alessandroargentieri]

@kaihoffman as product owner I would like to ask you if we want this behaviour to be added to the CLI. In fact, we have the equivalent:

$ civo objectstore credential secret --access-key <ACCESS-KEY-ID>
Your secret key is: <SECRET-ACCESS-KEY>

By adding the show command we are making the secret command useless. So maybe removable if we want to move in this direction and change things.