feat: add syntax warning param and refactor error message (issue #28)

[Inzerd]

GOAL:

fix issue #28, refactor message error during AST file parsing and add a new param to enable python SyntaxWarning

Changes

• CLI & Wizard Mode: Added a new parameter (flag) to enable/disable SyntaxWarning reporting. This allows users to decide if they want to treat syntax warnings as blocking issues or ignore them during scans.
• Refactoring get_python_file_asts:
  • Improved the logic that captures and reports errors during AST generation.
  • Standardized error messages to make them more descriptive when a file fails to parse.
  • Integrated the new enable_syntax_warnings logic within the core file-walking loop.
• Created a new test suite test_get_asts.py to verify:
  • Default behavior (warnings ignored).
  • Behavior when warnings are enabled (treated as errors/exceptions).
  • Handling of valid, invalid, and encoding-error files.

[ParzivalHack]

You removed by mistake the import from __future__ import annotations at the top of the file, which i added back. The rest is great, and i require no further changes :)