[WIP] Add utility to remove ParameterExpressions from SQL AST and integration tests

[Copilot]

• Create ParameterRemover utility in src/utils/ParameterRemover.ts
  • Implement the visitor pattern for AST traversal
  • Add logic to remove parameter expressions from binary expressions
  • Add special handling for logical expressions (AND/OR)
  • Add handling for recursive traversal (subqueries, CTEs)
• Create tests in tests/utils/ParameterRemover.test.ts
  • Add SqlComponent-level unit tests
  • Add query-level integration tests
• Create docs/test-policy.md to document test policy
• Update README.md to document the new feature

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[mk3008]

@copilot まずはSqlComponentからパラメータ式を除去するコードを書いて。それができたらレビューするからPR出して。