SERVER-81924 Introduce Classic Engine All Feature Flags build variant

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• Closed

SERVER-81527 Add QuerySettings to $planCacheStats output

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• Closed

SERVER-80931 Cache QuerySettings hash, such that it does not have to be recomputed for plan cache lookup

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• Backlog

SERVER-80937 Avoid linear lookup for allowed indexes in applyQuerySettings()

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• Backlog

SERVER-82573 Integrate QuerySettings into ExpressionContext

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• Closed