Add pyproject.toml

[huchenlei]

This PR adds pyproject.toml file to track ComfyUI version. Previous method relies on git being installed in the local system and the project is distributed as a git repo, which is not true for https://github.com/Comfy-Org/desktop.

After this PR, please update project.version each time a new version tag is created. Custom nodes can now do from comfyui_version import __version__ to get ComfyUI's version.

Some follow-up tasks:

• Merge ruff.toml to pyproject.toml's tools.ruff section
• Merge requirement.txt to dependencies / optional_dependencies sections. (When dependency is updated, a new github action will auto generate requirements.txt)
• Track stable build metadata (cuda version / python version) in a special metadata field and trigger stable-release.yml when version in pyproject.toml is changed.

Note:
toml library is added as Python's official support for toml(tomllib) is added in 3.11.

Reference:

• https://packaging.python.org/en/latest/specifications/pyproject-toml
• https://docs.python.org/3/library/tomllib.html
• https://pypi.org/project/toml/

[catboxanon]

Should there be concern for users not using Comfy-Org/desktop since this would be removing the additional info provided by git describe --tags?

[huchenlei]

Should there be concern for users not using Comfy-Org/desktop since this would be removing the additional info provided by git describe --tags?

There is definitely a behaviour change, but I don't think there is any extension currently referencing the comfyui_version in /system_stats API according to codesearch.

https://cs.comfy.org/search?q=context:global+comfyui_version&patternType=keyword&sm=0

[catboxanon]

That link requires a login but I'll take your word for it.

My concern was more into regards to bug reporting -- users using git (more or less everybody currently, except for early desktop beta adopters) who may report bugs inbetween stable releases and may mistakenly report the incorrect version number by reporting only what's shown in the UI -- but that can be resolved in other ways.

[huchenlei]

Offline discussion with @comfyanonymous:

• Drop the toml library dependency
• Add a github action that autogenerates a version.py file which defines __version__ from toml version change

[huchenlei]

Note: The update action verified to be working on #6404

[bigcat88]

• Add a github action that autogenerates a version.py

just note: usual approach is to name it _version.py or {project_name}_version.py(e.g.: comfy_version.py), to not conflict with version namespace which can be quite common.