## What changes were proposed in this pull request?

As per rxin request, here are further API changes
- Changed `Stream(Started/Progress/Terminated)` events to `Stream*Event`
- Changed the fields in `StreamingQueryListener.on***` from `query*` to `event`

## How was this patch tested?
Existing unit tests.

Author: Tathagata Das <tathagata.das1565@gmail.com>

Closes #15530 from tdas/SPARK-17731-1.