Finish implementations for non-generic rate limiters (Fixed windows, Sliding windows, Token bucket, Concurrency limiter)

[rafikiassumani-msft]

We will be providing the following non generic implementations for Rate Limiting:

• Fixed windows (@shreyaverma165 )
• Sliding windows (@shreyaverma165 )
• Token bucket (@BrennanConroy)
• Concurrency limiter (@BrennanConroy )

[ghost]

Thanks for contacting us.

We're moving this issue to the .NET 7 Planning milestone for future evaluation / consideration. We would like to keep this around to collect more feedback, which can help us with prioritizing this work. We will re-evaluate this issue, during our next planning meeting(s).
If we later determine, that the issue has no community involvement, or it's very rare and low-impact issue, we will close it - so that the team can focus on more important and high impact issues.
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