[chore] : Split test and development dependencies

[ns-rse]

In TopoStats we have separate [project.optional-dependencies] sections for dev, test and pypi as its possible some may want to run tests but not publish to PyPI.

We should perhaps consider splitting the optional dependencies here too so that installs only pull in what is required.

Suggest the following which adds build to pip (required if manually building the package locally rather than relying on CI) and pre-commit to dev.

[project.optional-dependencies]
dev = [
  "black",
  "pre-commit",
  "pylint",
  "ruff",
]
pip = [
  "build",
  "setuptools_scm[toml]",
  "wheel",
]
tests = [
  "pytest",
  "pytest-cov",
]

Caveat - its arguable that if someone is developing tests they should also have dev installed so that code is linted and passes pre-commit.ci, but don't want to force people to adopt this from the off.