Need to expose more details about subscription

[sbrossie]

The current view we have shows the following:

It is great for a high level view, but it misses a lot of info we have from the endpoint. In particular, for some operations we need the exact start date (timestamp). Today, the only field we show in addition to table fields, is the subscription#id. It's good but not enough. We need to at least show exact start/cancel dates. Options:

1. Add an other overlay with exact dates - similar to subscription#id, OR
2. Provide a way to inspect the json returned so we have all info when needed.

[sbrossie]

Note this will be needed to use #612