### Description

`stats x = count`  throws error `unknown column [count]` which is confusing since stats does not allow aliasing for existing columns but only points to aggregate functions.
Hence why the message should be `incorrect function declaration count, you forgot to add the parantheisis`. 
Same approach when dealing with a typo: `stats x = cont(*)` - `Unkown aggregate function cont - did you mean count()?`

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/analysis/Verifier.java
import org.elasticsearch.xpack.ql.expression.TypeResolutions;
import org.elasticsearch.xpack.ql.expression.function.aggregate.AggregateFunction;
import org.elasticsearch.xpack.ql.expression.predicate.BinaryOperator;
import org.elasticsearch.xpack.ql.expression.predicate.operator.comparison.BinaryComparison;
import org.elasticsearch.xpack.ql.plan.logical.Aggregate;
import org.elasticsearch.xpack.ql.plan.logical.Filter;
import org.elasticsearch.xpack.ql.plan.logical.Limit;
import org.elasticsearch.xpack.ql.plan.logical.LogicalPlan;
import org.elasticsearch.xpack.ql.plan.logical.OrderBy;
import org.elasticsearch.xpack.ql.plan.logical.Project;
import org.elasticsearch.xpack.ql.type.DataType;
import org.elasticsearch.xpack.ql.type.DataTypes;
import java.util.ArrayList;
import java.util.BitSet;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import java.util.stream.Stream;
import static org.elasticsearch.xpack.esql.stats.FeatureMetric.DISSECT;
import static org.elasticsearch.xpack.esql.stats.FeatureMetric.EVAL;
import static org.elasticsearch.xpack.esql.stats.FeatureMetric.GROK;
import static org.elasticsearch.xpack.esql.stats.FeatureMetric.LIMIT;
import static org.elasticsearch.xpack.esql.stats.FeatureMetric.SORT;
import static org.elasticsearch.xpack.esql.stats.FeatureMetric.STATS;
import static org.elasticsearch.xpack.esql.stats.FeatureMetric.WHERE;
import static org.elasticsearch.xpack.ql.analyzer.VerifierChecks.checkFilterConditionType;
import static org.elasticsearch.xpack.ql.common.Failure.fail;
import static org.elasticsearch.xpack.ql.expression.TypeResolutions.ParamOrdinal.FIRST;
public class Verifier {