SNOW-937190 Wait for idle sessions available

[sfc-gh-knozderko]

Description

SNOW-937190 Wait for idle sessions available if session count exceeds max count

Checklist

• Code compiles correctly
• Code is formatted according to Coding Conventions
• Created tests which fail without the change (if possible)
• All tests passing (dotnet test)
• Extended the README / documentation, if necessary
• Provide JIRA issue id (if possible) or GitHub issue id in PR name

[codecov]

Codecov Report

Attention: 19 lines in your changes are missing coverage. Please review.

Comparison is base (56f0b81) 81.62% compared to head (d42f4d5) 81.94%.

Files	Patch %	Lines
Snowflake.Data/Core/Session/SessionPool.cs	94.32%	5 Missing and 3 partials ⚠️
Snowflake.Data/Core/Session/WaitingQueue.cs	92.98%	3 Missing and 1 partial ⚠️
Snowflake.Data/Core/Session/NonWaitingQueue.cs	78.57%	3 Missing ⚠️
...wflake.Data/Core/Session/SessionOrCreationToken.cs	83.33%	0 Missing and 2 partials ⚠️
...flake.Data/Core/Session/SessionPoolEventHandler.cs	80.00%	2 Missing ⚠️

Additional details and impacted files

@@                         Coverage Diff                          @@
##           pool/SNOW-860872-connection-pool     #840      +/-   ##
====================================================================
+ Coverage                             81.62%   81.94%   +0.32%     
====================================================================
  Files                                    93      100       +7     
  Lines                                  9334     9589     +255     
  Branches                                858      877      +19     
====================================================================
+ Hits                                   7619     7858     +239     
- Misses                                 1475     1486      +11     
- Partials                                240      245       +5     

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[sfc-gh-mhofman]

Some small improvements left