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

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

[codecov[bot]]

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 :warning:
Snowflake.Data/Core/Session/WaitingQueue.cs	92.98%	3 Missing and 1 partial :warning:
Snowflake.Data/Core/Session/NonWaitingQueue.cs	78.57%	3 Missing :warning:
...wflake.Data/Core/Session/SessionOrCreationToken.cs	83.33%	0 Missing and 2 partials :warning:
...flake.Data/Core/Session/SessionPoolEventHandler.cs	80.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ 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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