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.

首先追蹤 parser 如何處理 CREATE TABLE IDENTIFIER(...)，以及 SingleQuotedString 值如何到達 IDENTIFIER 函式或 tokenizer。重現該範例，並確定預期結果是否為三個帶引號的識別碼；完成的標準是輸入不再被當作一個字面值處理，同時現有的解析行為保持不變。

由索引模型根據 Issue 內容生成。