feat: add object pascal assertion and performance markers

[krishna231122-del]

Summary

• Implements Object Pascal assertion and performance markers, fulfilling the planned roadmap item.
• Adds PascalPerfDialect with custom callee extraction logic to handle bare parenless statements and assignments unique to the Pascal AST.
• Registers the new dialect in the performance metrics engine and adds comprehensive unit test coverage.

Test Plan

• Tests pass (pytest) - Added dialect-specific callee extraction tests for Pascal AST nodes.
• Lint passes (ruff check .)
• Web build passes (npm run build) (if frontend changes) - N/A

Checklist

• My code follows the project's code style
• I have added tests for new functionality
• All existing tests still pass
• I have updated documentation if needed