Implement a fuzzing oracle for prefix iterator#71
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**Description** Implement a prefix iterator oracle by starting with a range iterator and filtering the iter based on the item key being prefixed by the lookup key. **Motivation** Previously the prefix fuzz action performed the lookup, but had no check on the result. The only thing this fuzzer checked was that it didn't hit any internal assertions or sanitizer errors. The oracle gives us confidence that the prefix iterator is actually functioning as intended. **Testing Done** Ran the fuzzer for one hour with no findings.
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Description
Implement a prefix iterator oracle by starting with a range iterator and
filtering the iter based on the item key being prefixed by the lookup
key.
Motivation
Previously the prefix fuzz action performed the lookup, but had no check
on the result. The only thing this fuzzer checked was that it didn't hit
any internal assertions or sanitizer errors. The oracle gives us
confidence that the prefix iterator is actually functioning as intended.
Testing Done
Ran the fuzzer for one hour with no findings.