pool/SNOW-937189 #3/4 busy sessions in pool

[sfc-gh-mhofman]

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

❗ No coverage uploaded for pull request base (pool/SNOW-860872-connection-pool@af36804). Click here to learn what that means.
The diff coverage is n/a.

❗ Current head 04914ff differs from pull request most recent head 186a6ea. Consider uploading reports for the commit 186a6ea to get more accurate results

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  Misses                                      ?     1390           
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[sfc-gh-knozderko]

it's a duplicate