Find missing WithCancellation on async enumerables

Proprietary

Detect async enumerable iteration without .WithCancellation(). Async enumerables should forward CancellationToken via WithCancellation.

OpenRewrite.Recipes.CSharp.CodeQuality.Performance.FindMissingWithCancellation

mod run . --recipe=OpenRewrite.Recipes.CSharp.CodeQuality.Performance.FindMissingWithCancellation

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