perf: add PersistentHashMap.findKeyD and PersistentHashSet.findD
#11907
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This PR implements `PersistentHashMap.findKeyD` and `PersistentHashSet.findD`. The motivation is avoid two memory allocations (`Prod.mk` and `Option.some`) when the collections contains the key.
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This PR implements
PersistentHashMap.findKeyDandPersistentHashSet.findD. The motivation is avoid two memory allocations (Prod.mkandOption.some) when the collections contains the key.