feat: SQL 语法支持 BETWEEN AND、DROP TABLE IF EXISTS

dist/metona-sqlark.d.ts

@@ -228,6 +228,8 @@ interface CreateTableStatement {
 interface DropTableStatement {
     type: 'DROP_TABLE';
     name: string;
+    /** IF EXISTS — 表不存在时不报错 */
+    ifExists?: boolean;
 }
 interface InsertStatement {
     type: 'INSERT';
@@ -696,6 +698,9 @@ declare enum TokenType {
     TRUE = "TRUE",
     REFERENCES = "REFERENCES",
     CASCADE = "CASCADE",
+    BETWEEN = "BETWEEN",
+    IF = "IF",
+    EXISTS = "EXISTS",
     FALSE = "FALSE",
     INNER = "INNER",
     LEFT = "LEFT",