Add z-order docs

[ulysses-you]

Why are the changes needed?

introduce how to use z-order with Kyuubi

How was this patch tested?

[codecov-commenter]

Codecov Report

Merging #1481 (7adeacd) into master (10034cd) will decrease coverage by 0.00%.
The diff coverage is n/a.

❗ Current head 7adeacd differs from pull request most recent head 98b3e5f. Consider uploading reports for the commit 98b3e5f to get more accurate results

@@             Coverage Diff              @@
##             master    #1481      +/-   ##
============================================
- Coverage     59.14%   59.13%   -0.01%     
  Complexity      172      172              
============================================
  Files           234      235       +1     
  Lines         12032    12050      +18     
  Branches       1475     1478       +3     
============================================
+ Hits           7116     7126      +10     
- Misses         4312     4319       +7     
- Partials        604      605       +1     

Impacted Files	Coverage Δ
...org/apache/kyuubi/ha/client/ServiceDiscovery.scala	41.26% <0.00%> (-2.61%)	⬇️
...rg/apache/kyuubi/engine/spark/SparkSQLEngine.scala	63.63% <0.00%> (-1.70%)	⬇️
...ala/org/apache/kyuubi/session/SessionManager.scala	62.80% <0.00%> (-0.53%)	⬇️
...in/scala/org/apache/kyuubi/config/KyuubiConf.scala	95.31% <0.00%> (ø)
...ache/kyuubi/ha/client/EngineServiceDiscovery.scala	50.00% <0.00%> (ø)
...i/ha/client/zookeeper/ServiceDiscoveryClient.scala	46.07% <0.00%> (ø)
...ache/kyuubi/engine/spark/SparkProcessBuilder.scala	87.61% <0.00%> (+0.61%)	⬆️

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[yaooqinn]

nit

[yaooqinn]

Introduction

[yaooqinn]

Let describe the picture

[yaooqinn]

Supported table format?

[yaooqinn]

thanks, merged to master