Implement a "watcher" into JSP

[vpavlin]

This "watcher" should watch pods related to a particular user and record major events. These events could then be visualized in JH or ODH dashboard for status/error reporting.

• Design the "watcher" process
• Design where/how the events are stored (e.g. in a special section in user ConfigMap)
• Propose how the events could be surfaced for the user (e.g. in JH - what is running for the user, what failed and why)

e.g.

• notebook pod got OOM killed
• pods deployed via services integration fail/are killed/are unschedullable
• notebook pod and all the services are running successfully - show some green lights in JH/ODH dashboard

CC @mroman-redhat @erikerlandson