chore(gitignore): update .gitignore to include Python, data, and R fi…

[project-delphi]

…le patterns

• Added patterns for common data file types (e.g., .csv, .xml)
• Included Python-specific ignore rules (e.g., pycache, *.pyc)
• Added rules for distribution and packaging directories (e.g., build/, dist/)
• Included ignore patterns for unit test and coverage reports (e.g., .tox/, .coverage)

[project-delphi]

@DavidAlberto , just updating gitignore for more general python/R ignoreable files

[project-delphi]

including ignoring checkpoint notebooks.