CLI command and notification to update ros

[omieliekh]

We need a mechanism to regularly check for ros-cli updates with convenient command to update it.

I suggest:

• check for updates with any command as post execution action with some interval
• check only if previous check was done more than 24 hours ago
• upon check, print ros command that will do the update of ros-cli, if update needed

[rjayroach]

That's a great idea. Rather than have a fixed 24 hours, I would have a setting likecheck_interval with default 24 hours, but can be set to any interval so if it's in heavy, e.g. hourly development, it can be set to a more aggressive value