This enhances the results of rbt status --json to show additional

information useful for automation.
The results are now in a review_requests key, instead of summaries,

which better identifies the type of results and allows for enhancement

in the future.
The review request ID (review_request_id) and URL

(review_request_url) are now provided, instead of just the ID.
The results also now include has_draft, shipit_count,

open_issue_count, approved, and approval_failure fields, which are

more useful for tools that may want to wrap this command.
It also cleans up some of the code to use more standard terminology

("review request" instead of "request" or "review"), and to fix

documentation and spacing.

Tested rbt status --json and saw the revised fields.