table alias without as fails to parse

Hello !

The following valid SQL statement fails to parse:

```sql
select my_alias.value from json_each('{"hello": "world"}') my_alias
```

It should parse the same as the following

```sql
select my_alias.value from json_each('{"hello": "world"}') AS my_alias
```

issue 中没有指定源文件或测试。首先针对 parser 运行两个 SQL 示例，并跟踪 FROM 子句表别名的入口点；当不带 AS 的别名能够成功解析，并且其行为与显式引入的别名相同时，即表示完成。

由索引模型根据 Issue 内容生成。