feat(flink): support insert multipe tables statement for FlinkSQL 1.15(#104)

* feat(flink): support insert multipe tables statement for FlinkSQL 1.15

* test: recover jest.config info

* fix(flink): correct typo

* fix(flinksql): resolve conflicts

test/helper.ts

@@ -10,7 +10,7 @@ export const readSQL = (dirname: string, fileName: string) => {
         const char = content[index];
         tmp += char;
 
-        const isMulti = tmp.includes('EXECUTE STATEMENT SET');
+        const isMulti = tmp.includes('EXECUTE STATEMENT SET') || tmp.includes('BEGIN STATEMENT SET;');
 
         if (!isMulti) {
             // 非批量的先简单按照分号切割

test/parser/flinksql/syntax/fixtures/insertMultipleTable.sql

@@ -1,3 +1,5 @@
+-- FlinkSQL 1.16：insert multiple table statement 
+
 EXECUTE STATEMENT SET 
 BEGIN
 INSERT INTO country_page_view
@@ -8,4 +10,13 @@ VALUES ('Chinese', 'mumiao', 18),
     ('Amercian', 'georage', 22);
 END;
 
+-- FlinkSQL 1.15：insert multiple table statement 
 
+BEGIN STATEMENT SET;
+INSERT INTO country_page_view
+VALUES ('Chinese', 'mumiao', 18),
+    ('Amercian', 'georage', 22);
+INSERT INTO country_page_view
+VALUES ('Chinese', 'mumiao', 18),
+    ('Amercian', 'georage', 22);
+END;