implementation of WFLY-2510

Add CLI command to display information about current connection.
Do you think it would make sense to create a ConnectionInfo JavaBean (perhaps an immutable one with a protected ctor) which would carry all the related info and store it under a single key instead of a key per property?
A thing to keep in mind is this ctx.get(...)/set(...) is a public API. Theoretically, anybody having access to ctx can manipulate the data. In general, these methods should be avoided whenever possible.