CSI: return plugin capabilities in plugin status

[tgross]

While working on debugging #10927 with some new-to-me CSI plugins, I found that being able to query the plugin capabilities as part of the output of nomad plugin status :plugin_id would be useful (perhaps only with the -verbose flag). The information is available in the state store, so it's just a matter of plumbing through all the RPC response, the HTTP API, and then the CLI.

[tgross]

Related: #10282

[tgross]

Oops, completely a duplicate of #10221

[github-actions]

I'm going to lock this issue because it has been closed for 120 days ⏳. This helps our maintainers find and focus on the active issues.
If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.