Add add_unstaged_mds to stage new files during pre-commit

[Umpire2018]

• Remove deprecated functions and optimize code style
• Add test cases for add_unstaged_mds method
• Reorganize project structure for execution with python -m approach
• close PermissionError raised in ai_doc/file_handler.py write_file function #3
• close pre-commit运行异常的解决方案设计 #2

Run test

python -m tests.test_change_detector

test_get_unstaged_mds: Unstaged Markdown files: ['test_file.md']

test_add_unstaged_mds: Number of remaining unstaged Markdown files after add: 0
.
test_get_staged_pys: Staged Python files: {'new_test_file.py': True}
.
test_get_unstaged_mds: Unstaged Markdown files: ['test_file.md']
.
----------------------------------------------------------------------
Ran 3 tests in 0.142s

OK

Use runner

python -m ai_doc.runner

2023-12-15 11:58:13,016 - INFO - 检测到暂存区中变更的文件：{'test.py': False}
2023-12-15 11:58:13,026 - INFO - 检测到变更对象：
{'added': {('create_directory', None)}, 'removed': set()}
2023-12-15 11:58:13,051 - INFO - 正在生成 test.py中的create_directory 对象文档...
2023-12-15 11:58:19,227 - INFO - HTTP Request: POST https://api.chatanywhere.tech/v1/chat/completions "HTTP/1.1 200 OK"
2023-12-15 11:58:19,234 - INFO - 已更新test.py文件的json结构信息。
2023-12-15 11:58:19,234 - INFO - 已更新test.py文件的Markdown文档。
2023-12-15 11:58:19,283 - INFO - 添加了 ['.project_hierachy.json', 'Markdown_Docs/test.md'] 到暂存区
2023-12-15 11:58:19,283 - INFO - 文档任务完成。