Implement view for `/cluster/versions` endpoint

[caspiano]

Is your feature request related to a problem? Please describe.

In the admin tab, the result of the /version endpoint is rendered. This only details the version of the API.

Describe the solution you'd like

Render /cluster/versions in the admin tab.
The data is in the format of

[
  {
    "service": "rest-api",
    "commit": "dc722c5869781928aa2d152fbd41a0e95da4d6de",
    "version": "1.29.3",
    "build_time": "Fri Sep 10 07:18:59 UTC 2021\n",
    "platform_version": "placeos-1.2109.1"
  },
  ...
]

I've also noticed that service and platform_version are not rendered in the current /version rendering.