fix(#54): add 4-space indented deflists

[KyleKing]

Fixes: #54

Adapted the mdformat-deflist plugin (https://github.com/executablebooks/mdformat-deflist/blob/bbcf9ed4f80847db58b6f932ed95e2c7a6c49ae5/mdformat_deflist/plugin.py) and unit tests for 4-space mkdocs style

[Copilot]

Pull Request Overview

This PR adds support for 4-space indented definition lists based on MkDocs Material conventions, addressing issue #54. The implementation adapts the mdformat-deflist plugin to work with the internal formatting system.

• Implements Material definition list support with 4-space indentation convention
• Adds comprehensive test coverage for various definition list scenarios
• Updates dependencies to newer versions including beartype, pytest-cov, and mypy

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
mdformat_mkdocs/mdit_plugins/_material_deflist.py	New plugin implementation for Material definition lists with 4-space indentation
mdformat_mkdocs/mdit_plugins/__init__.py	Exports the new definition list plugin functions
mdformat_mkdocs/plugin.py	Integrates the definition list plugin into the main formatter
tests/render/test_render.py	Adds test for definition list rendering
tests/render/fixtures/material_deflist.md	Test fixture for Material definition list rendering
tests/format/test_format.py	Adds formatting test for definition lists
tests/format/fixtures/material_deflist.md	Comprehensive test cases for definition list formatting scenarios
tests/pre-commit-test.md	Adds definition list example for manual testing
pyproject.toml	Updates test dependencies to newer versions

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