Update to use pyproject.toml only

[goanpeca]

Remove the use of setup.py and migrate all to pyproject.toml and hatch.

The source of truth for the version of the package remains on ignite/__init__.py.

[build-system]
requires = ["hatchling>=1.24.2"]
build-backend = "hatchling.build"

[project]
name = "pytorch-ignite"
authors = [
    {name = "PyTorch-Ignite Team", email = "[email protected]"},
]
...

Depends on:

• Update typing to fix errors [skip netlify] #3414

[vfdev-5]

We may need to change here the conditions when unit tests are triggered:

ignite/.github/workflows/unit-tests.yml

Lines 7 to 23 in adbb260

	paths:
	- "ignite/**"
	- "tests/ignite/**"
	- "tests/run_cpu_tests.sh"
	- "tests/run_code_style.sh"
	- "examples/**.py"
	- "requirements-dev.txt"
	- ".github/workflows/unit-tests.yml"
	pull_request:
	paths:
	- "ignite/**"
	- "tests/ignite/**"
	- "tests/run_cpu_tests.sh"
	- "tests/run_code_style.sh"
	- "examples/**.py"
	- "requirements-dev.txt"
	- ".github/workflows/unit-tests.yml"

[goanpeca]

@vfdev-5 could we change the netlify command to use so we can check this PR runs ok?

pip install . instead of python setup.py install ?

npm install katex && katex --version && pip install -U "networkx<3.2" numpy && pip install torch --extra-index-url https://download.pytorch.org/whl/cpu && python setup.py install && cd docs && pip install -r requirements.txt && make html

---

Besides the nigthly builds, which seem to be unrelated to this PR and related to precision differences, this one is ready for review.

[goanpeca]

I know setuptools was more convenient with respect to the conda build meta yaml, cause we could load the setup.py data. Conda build should provide something similar for pyproject.toml but it does not 🤦🏼 .

I could create a small pre-commit local hook so that we make sure the meta.yaml file is always up to date from the pyproject.toml (in a separate PR). Let me know what you think @vfdev-5

---

I tested the rest of the conda and pypi package creation locally step by step, to make sure all was working as expected.

[vfdev-5]

OK, I understand now what you were talking about when saying that conda recipe stuff support less pyproject. Can we write some bash or python script in this field {% set variable = script() %} to fetch the version from __init__.py ?
Maybe, we can provide this in a follow-up PR.

[vfdev-5]

Thanks a lot for the PR, Gonzalo!
Let's land it and see how it works