[SPARK-18459][SPARK-18460][STRUCTUREDSTREAMING] Rename triggerId to batchId and add triggerDetails to json in StreamingQueryStatus

## What changes were proposed in this pull request?

SPARK-18459: triggerId seems like a number that should be increasing with each trigger, whether or not there is data in it. However, actually, triggerId increases only where there is a batch of data in a trigger. So its better to rename it to batchId.

SPARK-18460: triggerDetails was missing from json representation. Fixed it.

## How was this patch tested?
Updated existing unit tests.

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

Closes #15895 from tdas/SPARK-18459.