Add ANY/ALL subquery operator normalization

- Map anyMatch to in (for expr == any subquery)
- Map allMatch to notIn (for expr != all subquery)

These SQL standard comparison operators with subqueries are normalized
to ClickHouse's IN/NOT IN functions in EXPLAIN AST output.

Fixes 5 statements in 02007_test_any_all_operators test.

Author: claude

internal/explain/format.go

@@ -294,6 +294,9 @@ func NormalizeFunctionName(name string) string {
 		"greatest":   "greatest",
 		"least":      "least",
 		"concat_ws":  "concat",
+		// SQL standard ANY/ALL subquery operators
+		"anymatch":   "in",
+		"allmatch":   "notIn",
 	}
 	if n, ok := normalized[strings.ToLower(name)]; ok {
 		return n

parser/testdata/02007_test_any_all_operators/metadata.json

@@ -1,6 +1,5 @@
 {
   "explain_todo": {
-    "stmt1": true,
     "stmt10": true,
     "stmt11": true,
     "stmt12": true,
@@ -11,14 +10,10 @@
     "stmt17": true,
     "stmt18": true,
     "stmt19": true,
-    "stmt2": true,
     "stmt20": true,
-    "stmt3": true,
-    "stmt4": true,
     "stmt5": true,
     "stmt6": true,
     "stmt7": true,
-    "stmt8": true,
-    "stmt9": true
+    "stmt8": true
   }
 }