Prevent sorting and count queries for non-SELECT statements.

[kssumin]

Changes

This PR addresses issue #2856 by adding proper validation to QueryEnhancer implementations to prevent invalid operations on non-SELECT statements.

Summary

Previously, QueryEnhancer would silently return default values or apply inappropriate operations when attempting to:

• Create count queries for INSERT/UPDATE/DELETE/MERGE statements
• Apply sorting to INSERT/UPDATE/DELETE/MERGE statements

This behavior was problematic as it could lead to unexpected results or silent failures.

What Changed

1. Statement Type Detection

   • Added StatementType enum to QueryInformation class
   • Implemented statement type detection using regex pattern matching in DefaultQueryEnhancer
   • Extended introspector classes (JpqlQueryIntrospector, HqlQueryIntrospector, EqlQueryIntrospector) to detect and propagate statement types

2. Validation Logic

   • QueryEnhancer.rewrite(): Now throws IllegalStateException when attempting to apply sorting to non-SELECT statements
   • QueryEnhancer.createCountQueryFor(): Now throws IllegalStateException when attempting to create count queries for non-SELECT statements
   • Unsorted rewriting is still allowed for all statement types (no-op behavior)

3. Affected Classes

   • DefaultQueryEnhancer: Added statement type detection and validation
   • JpaQueryEnhancer: Added validation for sorting and count queries
   • JSqlParserQueryEnhancer: Changed from returning original query to throwing exceptions
   • QueryInformation: Added StatementType enum and helper methods
   • HibernateQueryInformation: Extended to support statement type

4. Test Coverage

   • Added test cases to QueryEnhancerUnitTests for JPQL queries:
     • INSERT/UPDATE/DELETE statements throwing exceptions for count queries
     • INSERT/UPDATE/DELETE statements throwing exceptions for sorting
     • Unsorted operations working for all statement types
   • Added test cases to JSqlParserQueryEnhancerUnitTests for native queries:
     • INSERT/UPDATE statements throwing exceptions for count queries and sorting
     • Unsorted operations working for all statement types

Closes: #2856

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