Make Document Intelligence formulas opt-in

[lavish0000]

Summary

• make Document Intelligence formula extraction opt-in instead of enabling it for every OCR-capable file
• thread docintel_enable_formulas through MarkItDown into DocumentIntelligenceConverter
• add regression coverage for the default behavior and the explicit opt-in path

Testing

• UV_PROJECT_ENVIRONMENT=.venv_markitdown uv run --project packages/markitdown --with pytest python -m pytest packages/markitdown/tests/test_module_misc.py -k 'docintel_analysis_features or docintel_formula_setting or input_as_strings'
• UV_PROJECT_ENVIRONMENT=.venv_markitdown uv run --project packages/markitdown --with ruff python -m ruff check README.md packages/markitdown/src/markitdown/_markitdown.py packages/markitdown/src/markitdown/converters/_doc_intel_converter.py packages/markitdown/tests/test_module_misc.py
• UV_PROJECT_ENVIRONMENT=.venv_markitdown uv run --project packages/markitdown --with ruff python -m ruff format --check packages/markitdown/src/markitdown/_markitdown.py packages/markitdown/src/markitdown/converters/_doc_intel_converter.py packages/markitdown/tests/test_module_misc.py

Fixes #1536

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