Add Raw bytes toggle

[wallyqs]

Adds b short cut to toggle raw bytes mode:

Command          Description
                                                     
o<option>        Set primary sort key to <option>.                      
                                                                        
                 Option can be one of: {cid|subs|pending|msgs_to|msgs_from|
                 bytes_to|bytes_from|idle|last}
                                                                                                                                      
                 This can be set in the command line too with -sort flag.                                                                                     

n<limit>         Set sample size of connections to request from the server.

                 This can be set in the command line as well via -n flag.
                 Note that if used in conjunction with sort, the server
                 would respect both options allowing queries like 'connection
                 with largest number of subscriptions': -n 1 -sort subs

s                Toggle displaying connection subscriptions.

d                Toggle activating DNS address lookup for clients.

*b                Toggle displaying raw bytes.*

q                Quit nats-top.

Press any key to continue...

[dsidirop]

@wallyqs Thank you for being on top of things (no pun intended) :)

Please point out anything that you may find to be amiss on my pull-requests and I will sort it out asap.

Thank you again and be safe!