feat: #190 improve mysql grammer (#196)

* refactor: generic rename to mysql

* refactor: g4 with mysql syntax

* test: mysql syntax

* refactor: remove useless keywords

* refactor: remove nonReserved keywords

* refactor: lint specificFunction

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Co-authored-by: liuyi <liuyi@dtstack.com>

test/parser/pgsql/visitor.test.ts

@@ -2,7 +2,7 @@ import { AbstractParseTreeVisitor } from 'antlr4ts/tree/AbstractParseTreeVisitor
 import { PostgreSQLParserVisitor } from '../../../src/lib/pgsql/PostgreSQLParserVisitor';
 import PostgresSQL from '../../../src/parser/pgsql';
 
-describe('Generic SQL Visitor Tests', () => {
+describe('MySQL Visitor Tests', () => {
     const expectTableName = 'user1';
     const sql = `select id,name,sex from ${expectTableName};`;
     const parser = new PostgresSQL();