Metadata should be visible in entity info output when using tabular format

[cwjohnston]

Feature Suggestion

Entity metadata (e.g. labels and annotations) should be visible in the tabular output of sensuctl entity info

Context

Label metadata is expected to be specifically meaningful to operators, so it would be helpful for this information to be visible when using tabular output, which is both the default format and the most instantly human-readable.

[portertech]

Perhaps there are already too many fields in tabular output, not enough space! We either need the ability to configure which columns are displayed or lean on JSON output.

[calebhailey]

Related: #3667