chore: add more debug logging messages

[ryanking13]

This adds more debug logging messages and make it possible to configure the log level with PYWRANGLER_LOG env variable.

I think this is useful when users encounter issues using pywrangler and we want to understand what is happening.

example log:

DEBUG    pywrangler version: 1.7.0
DEBUG    Python: 3.12.12
DEBUG    Platform: darwin
DEBUG    Working directory: /Users/gyeongjae/Desktop/github/python-workers-examples/05-langchain
DEBUG    Sync needed - proceeding with installation
DEBUG    Using python version from wrangler config: 3.13
RUNNING  /Users/gyeongjae/Desktop/github/python-workers-examples/05-langchain/.venv-workers/bin/python --version
DEBUG    Virtual environment at /Users/gyeongjae/Desktop/github/python-workers-examples/05-langchain/.venv-workers already exists.
DEBUG    Pyodide virtual environment at /Users/gyeongjae/Desktop/github/python-workers-examples/05-langchain/.venv-workers/pyodide-venv already exists.
DEBUG    Reading /Users/gyeongjae/Desktop/github/python-workers-examples/05-langchain/pyproject.toml...
INFO     Found 3 dependencies.
DEBUG      - webtypy>=0.1.7
DEBUG      - langchain_core
DEBUG      - langchain_openai
INFO     Installing packages into .venv-workers...
RUNNING  uv pip install -r /var/folders/xp/y_tcbwcd3755wjchr2sp1_yc0000gn/T/tmpvn65t242.txt
INFO     Packages installed in .venv-workers.
DEBUG    Using vendor path: /Users/gyeongjae/Desktop/github/python-workers-examples/05-langchain/python_modules
INFO     Installing packages into python_modules...
RUNNING  uv pip install --no-build -r /var/folders/xp/y_tcbwcd3755wjchr2sp1_yc0000gn/T/tmpltb4s_ug.txt --extra-index-url https://index.pyodide.org/0.28.3 --index-strategy unsafe-best-match
RUNNING  uv pip list --format=freeze
DEBUG    Installed packages:
DEBUG      Using Python 3.13.2 environment at: .venv-workers/pyodide-venv
DEBUG      annotated-types==0.7.0
DEBUG      anyio==4.12.1
DEBUG      certifi==2026.1.4
DEBUG      charset-normalizer==3.4.4
DEBUG      distro==1.9.0
DEBUG      httpx==0.28.1
DEBUG      idna==3.11
DEBUG      jiter==0.9.0
DEBUG      jsonpatch==1.33
DEBUG      jsonpointer==3.0.0
DEBUG      langchain-core==1.1.0
DEBUG      langchain-openai==1.1.0
DEBUG      langsmith==0.4.52
DEBUG      openai==2.2.0
DEBUG      orjson==3.10.16
DEBUG      packaging==25.0
DEBUG      pydantic==2.10.6
DEBUG      pydantic-core==2.27.2
DEBUG      pyyaml==6.0.2
DEBUG      regex==2024.11.6
DEBUG      requests==2.32.5
DEBUG      requests-toolbelt==1.0.0
DEBUG      sniffio==1.3.1
DEBUG      tenacity==9.1.2
DEBUG      tiktoken==0.9.0
DEBUG      tqdm==4.67.1
DEBUG      typing-extensions==4.15.0
DEBUG      urllib3==2.6.3
DEBUG      webtypy==0.1.7
DEBUG      zstandard==0.23.0
INFO     Packages installed in python_modules.
SUCCESS  Sync process completed successfully.

[hoodmane]

Fantastic thanks!