Pool/SNOW-937188 changed session behavior

[sfc-gh-mhofman]

Description

• API to switch settings for the new pool
• API to get pool from the pool manger based on connection string (and if appropriate password)
• support for pooling or removing a connection when its properties (warehouse, role, db, schema) got altered

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

[gitguardian]

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