feat(base-query): add isIn/isNotIn, isNull/isNotNull, and Terminal.count()#94
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This adds three query operators to base-query's
Condition/TerminalAPI.Condition.isIn(Collection<V>)performs one reverse-map lookup per value and unions the results when the underlyingIndexablefunction is indexed, falling back to a linear scan otherwise;Condition.isNotIn(Collection<V>)is a default method built ondoesNotMatch(values::contains)since negation cannot be answered from a positive reverse-index without enumerating every object.Condition.isNull()andCondition.isNotNull()are thin default wrappers aroundisEqualTo(null)andisNotEqualTo(null), so they inherit the same indexed-vs-scan behavior for free.Terminal.count()is a small convenience default delegating tofindAll().count(), sparing callers from writing that boilerplate themselves.