Pool/SNOW-937189 busy sessions in pool (3/4)

[sfc-gh-knozderko]

Description

Connection Pool v2:

• introduction of a counter of busy sessions created by Pool Manager
• pool size counts both: Idle and Busy sessions

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: 1 lines in your changes are missing coverage. Please review.

Comparison is base (bf7a13e) 81.58% compared to head (6dced6c) 81.55%.

Files	Patch %	Lines
Snowflake.Data/Core/Session/SessionPool.cs	96.87%	1 Missing ⚠️

Additional details and impacted files

@@                         Coverage Diff                          @@
##           pool/SNOW-860872-connection-pool     #818      +/-   ##
====================================================================
- Coverage                             81.58%   81.55%   -0.04%     
====================================================================
  Files                                    91       93       +2     
  Lines                                  9313     9334      +21     
  Branches                                857      858       +1     
====================================================================
+ Hits                                   7598     7612      +14     
- Misses                                 1474     1483       +9     
+ Partials                                241      239       -2     

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