System.Diagnostics.Activity out of proc Rate-limited Sampling

[rajkumar-rangaraj]

The current out-of-process sampling design for System.Diagnostics.Activity supports AlwaysOn and TraceIdRatioBased sampling. To provide better control, propose adding support for Rate-limited Sampling.

We could leverage concepts from the OpenTelemetry .NET Contrib RateLimitingSampler, which was added by @samsp-msft.

/cc @noahfalk @tarekgh @samsp-msft @CodeBlanch @ramthi

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