Add VolumeWeightedPricingEngine implementationfeat(pricing): implemen… #32
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…t VolumeWeightedPricingEngine for volume-weighted clearing price
Implement a volume-weighted pricing engine that calculates the clAdds a new pricing strategy that computes the clearing price as the volume-weighted average of individual order prices. Each order's price is weighted by its sell amount. Includes unit tests for weighted average and single/empty cases.
Closes #31.earing price based on individual order prices weighted by sell volume. Includes tests for weighted average calculation and handling of insufficient orders.