IDENTIFIER literal with double quotes inside single quotes is parsed as one token instead of multiple identifiers

When running the following statement:

CREATE TABLE IDENTIFIER('"ORGDATA"."PUBLIC"."car_sales"')

the parser produces:

SingleQuotedString("\"ORGDATA\".\"PUBLIC\".\"car_sales\"")

It is treated as a single token (a literal string) instead of being parsed into three separate identifiers ("ORGDATA", "PUBLIC", "car_sales").
Since the IDENTIFIER function expects a literal, the content must be re-parsed.

**Suggestions:**

1. Expose a function that can take a SingleQuotedString like: '"ORGDATA"."PUBLIC"."car_sales"' and re-parse it into separate Ident tokens (ORGDATA, PUBLIC, car_sales).

2. change the tokenizer so that when IDENTIFIER is used with a quoted string containing double quotes, the inner content is tokenized as identifiers rather than treated as a raw single string.

首先追踪 parser 如何处理 CREATE TABLE IDENTIFIER(...) ，以及 SingleQuotedString 值如何到达 IDENTIFIER 函数或 tokenizer。复现该示例，并确定预期结果是否为三个带引号的标识符；完成的标准是输入不再被当作一个字面量处理，同时现有的解析行为保持不变。

由索引模型根据 Issue 内容生成。