Update SOS to show the relevant information for the `!ThreadPool` command when using the Windows thread pool

[kouvel]

In the !ThreadPool command it would be nice to show the following:

• Which thread pool is being used
• The number of thread pool threads that currently exist (this is tracked in s_threadCount)
• Queued work items when the -wi switch is provided

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Issue Details

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In the !ThreadPool command it would be nice to show the following:

• Which thread pool is being used
• The number of thread pool threads that currently exist (this is tracked in s_threadCount)
• Queued work items when the -wi switch is provided

Author:	kouvel
Assignees:	eduardo-vp
Labels:	area-System.Threading
Milestone:	8.0.0

[eduardo-vp]

Current work is in dotnet/diagnostics#4160 and microsoft/clrmd#1175. As Lee Culver commented in the latter, there's currently a migration process from the clrmd codebase to dotnet/diagnostics. I'll test again once the migration is completed.

[eduardo-vp]

Closing the issue since both PRs were already merged