Expose metrics of engine startup permit state

[LennonChin]

Why are the changes needed?

The metrics kyuubi_operation_state_LaunchEngine_* cannot reflect the state of Semaphore after configuring the maximum engine startup limit through kyuubi.server.limit.engine.startup, add some metrics to show the relevant permit state.

How was this patch tested?

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

[LennonChin]

@wForget cc

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.

Project coverage is 0.00%. Comparing base (fc654cf) to head (483f44e).

Files with missing lines	Patch %	Lines
...g/apache/kyuubi/session/KyuubiSessionManager.scala	0.00%	7 Missing ⚠️
...a/org/apache/kyuubi/metrics/MetricsConstants.scala	0.00%	4 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #7072   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files         697     697           
  Lines       43192   43203   +11     
  Branches     5854    5854           
======================================
- Misses      43192   43203   +11     

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