[KYUUBI #1018] Set spark.sql.execution.topKSortFallbackThreshold to 10000

[byyue]

Why are the changes needed?

To avoid performance issues in the topK scenario and close #1018 .

How was this patch tested?

• Add some test cases that check the changes thoroughly including negative and positive cases if possible

• Add screenshots for manual tests if appropriate

• Run test locally before make a pull request

[codecov-commenter]

Codecov Report

Merging #1054 (5ed0ae2) into master (6509a6b) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 5ed0ae2 differs from pull request most recent head 21de1fc. Consider uploading reports for the commit 21de1fc to get more accurate results

@@            Coverage Diff            @@
##             master    #1054   +/-   ##
=========================================
  Coverage     78.70%   78.70%           
  Complexity       61       61           
=========================================
  Files           169      169           
  Lines          6249     6250    +1     
  Branches        725      725           
=========================================
+ Hits           4918     4919    +1     
  Misses          907      907           
  Partials        424      424           

Impacted Files	Coverage Δ
...rg/apache/kyuubi/engine/spark/SparkSQLEngine.scala	71.83% <100.00%> (+0.40%)	⬆️

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[yaooqinn]

thanks, merged to master