[KYUUBI #3060] [Subtask][#3059] Build content of the connector document section

[yaooqinn]

Why are the changes needed?

Build content of the connector document section

Main changes proposed in this PR

• the integration section is renamed to connector and lifted up
• connectors are separated by engines
• the usage guide is broken into 2 section: Admin Guide and User Guide

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 #3061 (6932cbb) into master (32970ce) will increase coverage by 0.94%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #3061      +/-   ##
============================================
+ Coverage     50.56%   51.50%   +0.94%     
  Complexity        6        6              
============================================
  Files           455      453       -2     
  Lines         25631    25167     -464     
  Branches       3589     3506      -83     
============================================
+ Hits          12960    12962       +2     
+ Misses        11435    10965     -470     
- Partials       1236     1240       +4     

Impacted Files	Coverage Δ
...ache/kyuubi/operation/KyuubiOperationManager.scala	80.82% <0.00%> (-1.37%)	⬇️
...g/apache/kyuubi/server/KinitAuxiliaryService.scala	65.78% <0.00%> (-0.88%)	⬇️
...he/kyuubi/jdbc/hive/ZooKeeperHiveClientHelper.java	2.88% <0.00%> (-0.76%)	⬇️
...yuubi/server/metadata/jdbc/JDBCMetadataStore.scala	89.27% <0.00%> (-0.70%)	⬇️
...n/scala/org/apache/kyuubi/engine/ProcBuilder.scala	83.12% <0.00%> (-0.63%)	⬇️
...in/scala/org/apache/kyuubi/config/KyuubiConf.scala	97.25% <0.00%> (-0.08%)	⬇️
...in/java/org/apache/kyuubi/jdbc/hive/JdbcTable.java	0.00% <0.00%> (ø)
...n/java/org/apache/kyuubi/jdbc/hive/JdbcColumn.java	0.00% <0.00%> (ø)
...java/org/apache/kyuubi/jdbc/hive/auth/SaslQOP.java	0.00% <0.00%> (ø)
...ava/org/apache/kyuubi/jdbc/hive/cli/FetchType.java	0.00% <0.00%> (ø)
... and 22 more

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[yaooqinn]

thanks, merged to master