uncleGen opened a new pull request #26201: [SPARK-29543][SS][UI] Init 
structured streaming ui
URL: https://github.com/apache/spark/pull/26201
 
 
   ### What changes were proposed in this pull request?
   
   - Add two pages
      - "/sql/streaming": Streaming Query Page, providing some aggregate 
information for running/complete streaming queries.
     - "/sql/streaming/statistics": Streaming Query Statistics Page, providing 
detailed information for streaming query, including `Input Rate`, `Process 
Rate`, `Input Rows`, `Batch Duration` and `Operation Duration`
   - Add two new metric `totalInputRecords` and `batchDuration` 
   - Add two html resource files: `streaming-page.css` and `streaming-page.js`
   
   
![image](https://user-images.githubusercontent.com/7402327/67258613-15eafd80-f4c4-11e9-8d46-3fec8a07ff08.png)
   
![image](https://user-images.githubusercontent.com/7402327/67258631-2b602780-f4c4-11e9-93df-03e1e060cf12.png)
   
![image](https://user-images.githubusercontent.com/7402327/67259136-e38ecf80-f4c6-11e9-82df-42cc8d4f73df.png)
   
![image](https://user-images.githubusercontent.com/7402327/67259140-eb4e7400-f4c6-11e9-9f5c-41058750b493.png)
   
   ### Why are the changes needed?
   
   It helps users to better monitor Structured Streaming job.
   
   ### Does this PR introduce any user-facing change?
   
   No
   
   ### How was this patch tested?
   
   Existing UT and manual test

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