feat: add generic SQL language support (#469)

* fix(generic): fix INTERSECT/EXCEPT support, trim keywords to ~90

- Add INTERSECT and EXCEPT to queryNoWith rule for set operations
- Remove 173 unused KW_* lexer rules for removed features (views, indexes,
  grants, transactions, stored procedures, window functions, triggers, etc.)
- Trim nonReserved list to only keywords actually used in parser rules
- Remove unused UNICODE_STRING and DIGIT_IDENTIFIER lexer rules
- Keyword count reduced from 263 to 90 (close to ~100 target)
- All 197 test suites pass (5627 tests)

* fix(generic): reserve core structural keywords and add DIGIT_IDENTIFIER

- Remove core structural keywords from nonReserved so they cannot be
  used as identifiers: SELECT, FROM, WHERE, CREATE, TABLE, INSERT,
  UPDATE, DELETE, DROP, ALTER, SET, JOIN, GROUP, HAVING, ORDER, ON,
  UNION, INTERSECT, EXCEPT, INTO, NOT, AND, OR, IN, BETWEEN, LIKE,
  IS, EXISTS, CASE, WHEN, THEN, ELSE, END, CAST, AS, DISTINCT,
  PRIMARY, CONSTRAINT, REFERENCES, COLUMN, UNIQUE, CHECK, FOREIGN,
  RENAME, RECURSIVE, WITH, NULL, ESCAPE, NULLIF
- Add DIGIT_IDENTIFIER lexer token for identifiers starting with a
  digit (e.g. 123abc, 1st_column)
- Include DIGIT_IDENTIFIER in identifier rule alternatives

* fix(generic): add missing Listener/Visitor exports and diagnostics option

- Add GenericSqlListener and GenericSqlVisitor exports to src/index.ts
- Add GenericSQLOptions interface with configurable diagnostics flag
- Override validate() to return empty array when diagnostics disabled
- Export GenericSQLOptions type from src/index.ts

* fix(generic): add QUERY_RESULT and SELECT column entity collection

- Add exitQuerySpecification for QUERY_RESULT entity tracking
- Add exitSelectItem for column entity collection in SELECT clauses
- Track wildcard columns (ColumnDeclareType.ALL) for * and table.*
- Track expression columns with alias support (ColumnDeclareType.EXPRESSION)
- Stage previously untracked files (errorListener, splitListener, semanticContextCollector)

* test: add GenericSQL tests

* test: ensure all dialect tests pass with GenericSQL

* test(generic): add more sql test

- Add comprehensive syntax tests for all supported statement types
- Add context collect tests for entity and semantic collectors
- Add suggestion tests for token, syntax, and multi-statement scenarios
- Add error strategy, listener, visitor, and validation tests
- Fix entity collector to distinguish simple columns from expressions

Author: liuxy0551

README-zh_CN.md

@@ -26,6 +26,7 @@ dt-sql-parser 是一个基于 [ANTLR4](https://github.com/antlr/antlr4) 开发
 - PostgreSQL
 - Trino
 - Impala
+- GenericSQL
 
 > 提示：当前所有的 SQL Parser 是 `Typescript` 语言版本，如果有需要，可以尝试编译 Grammar 文件到其他目标语言。
 
@@ -51,7 +52,7 @@ yarn add dt-sql-parser
 ## 使用
 在开始使用前，需要先了解基本用法。`dt-sql-parser` 为不同类型的 SQL 分别提供相应的 SQL 类：
 ```typescript
-import { MySQL, FlinkSQL, SparkSQL, HiveSQL, PostgreSQL, TrinoSQL, ImpalaSQL } from 'dt-sql-parser';
+import { MySQL, FlinkSQL, SparkSQL, HiveSQL, PostgreSQL, TrinoSQL, ImpalaSQL, GenericSQL } from 'dt-sql-parser';
 ```
 
 在使用语法校验，自动补全等功能之前，需要先实例化对应 SQL 类，以 `MySQL` 为例：

README.md

@@ -26,6 +26,7 @@ Additionally, it provides advanced features such as **SQL Validation**, **Code C
 - PostgreSQL
 - Trino
 - Impala
+- GenericSQL
 
 >[!TIP]
 >This project is the default for Typescript target, also you can try to compile it to other languages if you need.
@@ -53,7 +54,7 @@ yarn add dt-sql-parser
 ## Usage
 We recommend learning the fundamentals usage before continuing. The dt-sql-parser library provides SQL classes for different types of SQL.
 ```javascript
-import { MySQL, FlinkSQL, SparkSQL, HiveSQL, PostgreSQL, TrinoSQL, ImpalaSQL } from 'dt-sql-parser';
+import { MySQL, FlinkSQL, SparkSQL, HiveSQL, PostgreSQL, TrinoSQL, ImpalaSQL, GenericSQL } from 'dt-sql-parser';
 ```
 
 Before using syntax validation, code completion, and other features, it is necessary to instantiate the Parser of the relevant SQL type.