[KYUUBI #6926] Add SERVER_LOCAL engine share level

[taylor12805]

Why are the changes needed?

As clarified in #6926, there are some scenarios user want to launch engine on each kyuubi server. SERVER_LOCAL engine share level implement this function by extracting local host address as subdomain, in which case each kyuubi server's engine is unique.

How was this patch tested?

Was this patch authored or co-authored using generative AI tooling?

No

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 21 lines in your changes missing coverage. Please review.

Project coverage is 0.00%. Comparing base (1937dd9) to head (e06de79).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...ain/scala/org/apache/kyuubi/engine/EngineRef.scala	0.00%	18 Missing ⚠️
...in/scala/org/apache/kyuubi/config/KyuubiConf.scala	0.00%	2 Missing ⚠️
...in/scala/org/apache/kyuubi/engine/ShareLevel.scala	0.00%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #7013   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files         694     694           
  Lines       42750   42770   +20     
  Branches     5820    5825    +5     
======================================
- Misses      42750   42770   +20     

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